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21 January, 17:50

What number needs to be added to both sides of the equation in order to complete the square?

x^2+16x=18

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Answers (2)
  1. 21 January, 19:16
    0
    You have to subtract 18 from both sides

    x^2 + 16x = 18

    x^2 + 16x (-18) = 18 - 18

    x^2 + 16x - 18 is your answer : D
  2. 21 January, 19:37
    0
    Answer: c = 64

    In order to find the 'c' value to complete the square, you use the equation c = (b/2) ^2. Since 16 = b, c will equal 64. 16/2 = 8, and 8^2 = 64. The final resulting equation will be (x+8) ^2 = 82.
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