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13 March, 04:06

Which are the solutions of x^2 = - 7x - 8?

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Answers (2)
  1. 13 March, 05:36
    0
    First put in standard form and do factoring or the quadratic formula
  2. 13 March, 07:27
    0
    The first term is, x2 its coefficient is 1.

    The middle term is, - 2x its coefficient is - 2.

    The last term, "the constant", is - 3

    Step-1 : Multiply the coefficient of the first term by the constant 1 • - 3 = - 3

    Step-2 : Find two factors of - 3 whose sum equals the coefficient of the middle term, which is - 2.

    -3 + 1 = - 2 That's it

    Step-3 : Rewrite the polynomial splitting the middle term using the two factors found in step 2 above, - 3 and 1

    x2 - 3x + 1x - 3

    Step-4 : Add up the first 2 terms, pulling out like factors:

    x • (x-3)

    Add up the last 2 terms, pulling out common factors:

    1 • (x-3)

    Step-5 : Add up the four terms of step 4:

    (x+1) • (x-3)

    Which is the desired factorization
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