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16 March, 13:53

Which of the following are solutions to 2x^2 - 8x - 90? Select all that apply. A) 2, B) - 5, C) - 7, D) 9, E) 15, F) 5, G) 7

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  1. 16 March, 14:47
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    2x^2 - 8x - 90

    = 2 (x^2 - 4x - 45)

    = 2 (x - 9) (x + 5)

    so

    x - 9 = 0; x = 9

    x + 5 = 0; x = - 5

    solutions - 5 and 9

    answer

    B) - 5

    D) 9
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