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24 December, 09:03

8x^2-2x-3=0 find the solution

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  1. 24 December, 09:49
    0
    Factor using ac method

    mulitply 8 and - 3

    -24

    find what 2 factors of - 24 add to - 2

    -6 and 4

    split middle up like that

    8x²+4x-6x-3=0

    gropu and factor

    (8x²+4x) + (-6x-3) = 0

    4x (2x+1) + (-3) (2x+1) = 0

    undistribute

    (4x-3) (2x+1) = 0

    set each to zero

    4x-3=0

    4x=3

    x=3/4

    2x+1=0

    2x=-1

    x=-1/2

    x=-1/2 or 3/4
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