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11 June, 15:47

Solve the equation using the method of completing the square 2x squared + 16 x - 8 0

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  1. 11 June, 18:59
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    -4 + 2*sqrt (5)

    Step-by-step explanation:

    2x^2+16x-8=0

    Factor out the 2: 2 (x^2+8x) - 8=0

    Add (b/2) ^2 = (8/2) ^2 = 16

    2 (x^2+8x+16) - 8 = 0 + 2*16

    2 (x+4) ^2=40

    (x+4) ^2=20

    x+4=+sqrt (20)

    x=-4+sqrt (20) = - 4 + 2*sqrt (5)
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