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23 June, 14:08

What are the solutions to the quadratic equation 3 (x - 4) 2 = 75?

cok

O

x = - 9 and x = 1

x = - 5 and x = 5

x = - 4 and x = 4

x = - 1 and x = 9

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Answers (1)
  1. 23 June, 14:21
    0
    3 (x-4) ²=75 / /:3

    (x-4) ²=25

    (x-4) ²-25=0

    x²+x+9x-9=0

    x (x+1) - 9 (x+1) = 0

    (x+1) (x-9) = 0

    x+1=0 x-9=0

    x=-1 x=9

    x=-1 and x=9
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