Q&A for How to Evaluate an Algebraic Expression

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  • Question
    How do I evaluate 10 and -7 ?
    Donagan
    Top Answerer
    10 + (-7) = 10 - 7 = 3.
  • Question
    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.
  • Question
    How do I write the sum of a, b and c?
    Donagan
    Top Answerer
    a + b + c.
  • Question
    How do I evaluate the expression z3 if z = 24?
    Donagan
    Top Answerer
    When z = 24, 3z is 72. If you're asking about z³, that's 13,824.
  • Question
    How do I evaluate y² - 5z + 12 when y is =7 and z is =5?
    Donagan
    Top Answerer
    7² - 5(5) + 12 = 49 - 25 + 12 = 36.
  • Question
    How do I evaluate 3 to the power of -2?
    Donagan
    Top Answerer
    It is the same as 1 ÷ 3², or 1/9, or 0.1111...
  • Question
    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.
  • Question
    How do I evaluate 15*x^3 - 11*x^3 + 10?
    Donagan
    Top Answerer
    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.
  • Question
    How do I simplify fractions?
    Donagan
    Top Answerer
    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.
  • Question
    How do I evaluate 2.5 - x ; x = 1.8?
    Donagan
    Top Answerer
    Substitute 1.8 for x: 2.5 - 1.8 = 0.7. That's the value of (2.5 - x) when x=1.8.
  • Question
    How do I evaluate the expression. 6 - (-9)(5 - (-4))?
    Donagan
    Top Answerer
    Perform the multiplication first: (-9)[5 - (-4)] = (-9)(5 + 4) (-9)(9) = -81. Then subtract: 6 - (-81) = 6 + 81 = 87.
  • Question
    How do I evaluate 4cd when c = 5 and d = 7?
    Donagan
    Top Answerer
    (4)(5)(7) = 140.
  • Question
    How do I evaluate 3(x-1) when x=9?
    Community Answer
    Substitute 9 for x in the expression: 3(9 - 1) = 3(8) = 24.
  • Question
    How do I evaluate 3abc + bc - a?
    Community Answer
    You can't evaluate that expression, because it's not an equation. You could do some factoring, but that wouldn't help.
  • Question
    How do I evaluate 2.5 - x ; x = 1.8?
    I_l1ke_gam3s
    Community Answer
    That's 2.5 - 1.8 which is 0.7.
  • Question
    What is the value of the expression | 174 − 280 |?
    I_l1ke_gam3s
    Community Answer
    174 - 280 = -107, and the absolute value of -107 is 107. Absolute values are always positive.
  • Question
    What is (-2) to the power of (-4)?
    Community Answer
    (-2)^(-4) = (-1/2)^4 = (-½)(-½)(-½)(-½) = +1/16 (or 1/16).
  • Question
    How do I evaluate 3²-2²+4?
    Community Answer
    3² - 2² + 4 = 9 - 4 + 4 = 9.
  • Question
    What is 2ab - 3b²c + a³bc - 5ab², if a =0, b=1 and c = 2?
    Community Answer
    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.
  • Question
    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.
  • Question
    How do I evaluate 3²-2²+4?
    Community Answer
    3² - 2² + 4 = 9 - 4 + 4 = 9.
  • Question
    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.
  • Question
    Evaluate 12/y when y is equal to 2
    I_l1ke_gam3s
    Community Answer
    This is just some simple division that you learned in 3rd or 4th grade. 12/2 = 6, so your answer is 6.
  • Question
    if k=2, m=3, and n=5, find 5k+12k-mn.
    Community Answer
    That's (5)(2) + (12)(2) - (3)(5), which is 10 + 24 - 15 = 19.
  • Question
    How do you evaluate the expression 13 - 4x, given that x is -3?
    Community Answer
    13 - 4(-3) = 13 - (-12) = 13 + 12 = 25.
  • Question
    Can you tell me what the applications of evaluating algebraic expressions are?
    Donagan
    Top Answerer
    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.
  • Question
    Donagan
    Top Answerer
  • Question
    How do I evaluate 2xy?
    Donagan
    Top Answerer
    You would have to know the values of x and y. Then multiply 2 by x, and then multiply that product by y.
  • Question
    How do I evaluate the expression 2(2x - 1) = 10?
    Donagan
    Top Answerer
    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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