Q&A for How to Evaluate an Algebraic Expression

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How do I evaluate 10 and -7 ?

Donagan

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10 + (-7) = 10 - 7 = 3.

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If x can have only values -3, 0, and 2, and y can have only the values -4, 2, and 3, what is the greatest possible value for 2x + y^2?

Community Answer

Use 2, the highest positive value of x, and -4, the highest absolute value of y (because it's squared), and evaluate the expression.

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How do I write the sum of a, b and c?

Donagan

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a + b + c.

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How do I evaluate the expression z3 if z = 24?

Donagan

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When z = 24, 3z is 72. If you're asking about z³, that's 13,824.

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How do I evaluate y² - 5z + 12 when y is =7 and z is =5?

Donagan

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7² - 5(5) + 12 = 49 - 25 + 12 = 36.

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How do I evaluate 3 to the power of -2?

Donagan

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It is the same as 1 ÷ 3², or 1/9, or 0.1111...

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Is the expression y+4 equivalent to the expression 1y+4?

Community Answer

Yes. Any variable without a coefficient is understood to have a coefficient of 1.

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How do I evaluate 15*x^3 - 11*x^3 + 10?

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The first two terms are "like" terms and can be combined into 4x³. The third term is not a "like" term and cannot be combined with the first two. So the final value is 4x³ + 10.

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How do I simplify fractions?

Donagan

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Reduce the fraction to lowest terms. Do this by dividing both the numerator and the denominator by the largest number that will divide evenly into both. If it's an improper fraction, you may wish to convert it to a mixed number.

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How do I evaluate 2.5 - x ; x = 1.8?

Donagan

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Substitute 1.8 for x: 2.5 - 1.8 = 0.7. That's the value of (2.5 - x) when x=1.8.

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How do I evaluate the expression. 6 - (-9)(5 - (-4))?

Donagan

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Perform the multiplication first: (-9)[5 - (-4)] = (-9)(5 + 4) (-9)(9) = -81. Then subtract: 6 - (-81) = 6 + 81 = 87.

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How do I evaluate 4cd when c = 5 and d = 7?

Donagan

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(4)(5)(7) = 140.

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How do I evaluate 3(x-1) when x=9?

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Substitute 9 for x in the expression: 3(9 - 1) = 3(8) = 24.

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How do I evaluate 3abc + bc - a?

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You can't evaluate that expression, because it's not an equation. You could do some factoring, but that wouldn't help.

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How do I evaluate 2.5 - x ; x = 1.8?

I_l1ke_gam3s

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That's 2.5 - 1.8 which is 0.7.

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What is the value of the expression | 174 − 280 |?

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174 - 280 = -107, and the absolute value of -107 is 107. Absolute values are always positive.

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What is (-2) to the power of (-4)?

Community Answer

(-2)^(-4) = (-1/2)^4 = (-½)(-½)(-½)(-½) = +1/16 (or 1/16).

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How do I evaluate 3²-2²+4?

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3² - 2² + 4 = 9 - 4 + 4 = 9.

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What is 2ab - 3b²c + a³bc - 5ab², if a =0, b=1 and c = 2?

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Since a = 0, we can eliminate all but the second term, because the other terms involve multiplying by 0, which always equals zero. That leaves (-3b²c) = (-3)(1)²(2) = -6.

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How do I evaluate 3²-2²+4

I_l1ke_gam3s

Community Answer

That is just simple math you have to do. This is 9-4+4 which is 9 so your final answer is equal to 9.

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How do I evaluate 3²-2²+4?

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3² - 2² + 4 = 9 - 4 + 4 = 9.

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How do I know the value of x and y in an equation?

Community Answer

If you are trying to find the value of x, for example, you have to isolate the x. That means changing the equation so that x is alone on one side of the equation. To do that, you have to add, subtract, multiply and/or divide by the numbers that are on the same side of the equation with x. For example, let's say the equation is (2x + 4) / 5 = 2. In order to isolate the x, you first multiply both sides of the equation by 5. That gets rid of the fraction: 2x + 4 = 10. Next you subtract 4 from both sides: 2x = 6. Now divide both sides by 2: x = 3.

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Evaluate 12/y when y is equal to 2

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This is just some simple division that you learned in 3rd or 4th grade. 12/2 = 6, so your answer is 6.

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if k=2, m=3, and n=5, find 5k+12k-mn.

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That's (5)(2) + (12)(2) - (3)(5), which is 10 + 24 - 15 = 19.

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How do you evaluate the expression 13 - 4x, given that x is -3?

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13 - 4(-3) = 13 - (-12) = 13 + 12 = 25.

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Can you tell me what the applications of evaluating algebraic expressions are?

Donagan

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There are so many real-life applications for algebra that it's impossible to list them all. Algebraic expressions are used in every science as well as engineering, industry and business.

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Donagan

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Question

How do I evaluate 2xy?

Donagan

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You would have to know the values of x and y. Then multiply 2 by x, and then multiply that product by y.

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How do I evaluate the expression 2(2x - 1) = 10?

Donagan

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2(2x - 1) = 4x - 2 = 10. Add 2 to both sides of the equation: 4x = 12. Divide both sides by 4: x = 3.

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