Rewrite the equation by completing the square. f (x) = x^2 + 20x – 86

Question

Rewrite the equation by completing the square. f (x) = x^2 + 20x – 86

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Everleigh 3 weeks 2021-09-28T16:53:00+00:00 1 Answer 0

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    2021-09-28T16:54:26+00:00

    Answer:

    f(x) = (x+10)^2 – 86

    Step-by-step explanation:

    1. f(x) = x^2 + 20x – 86
    2. f(x) = x^2 + 20x + 100 – 86 (because (20/2)^2 = 100)
    3. f(x) = (x+10)^2 – 86

    Completing the square means you do (b/2)^2 where b is: a^2x + bx + c.

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