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27 October, 09:52

Solve the equation.

3x^2 - 16x = x^2 - 30

A. 3,5

B. - 3/2,5

C. - 5,-3/2

D. - 3,-5

+1
Answers (1)
  1. 27 October, 10:21
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    3x^2-16x=x^2-30

    3x^2-x^2-16x+30=0

    2x^2-16x+30=0

    2 * (x^2-8x+15) = 0

    x^2-8x+15=0

    +1 + 1

    we solve it by completing the square

    x^2-2*4x+16=1

    (x-4) ^2=1

    x-4=1 or x-4 = - 1

    +4 + 4 + 4 + 4

    x=5 or x = 3 the answer is A
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