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7 December, 05:19

Let x^2+2x-15 = 0 use quadratic formula to find the roots. (roots are whole numbers)

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  1. 7 December, 05:38
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    Hello!

    We have:

    X^2 + 2x-15 = 0

    Where:

    a = 1

    b = 2

    c = - 15

    Delta = b^2 - 4. a. c

    D = 2^2 - 4.1. (-15)

    D = 4 + 60

    D = 64

    We know,

    x = [ - b+/-Raiz (delta) ]/2a

    x = [ - 2 + / - Raiz (64) ]/2

    x = [-2 + / - 8]/2

    Then,

    x' = (-2-8) / 2 - 5

    And

    x" = (-2+8) / 2 3
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