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26 August, 20:26

Find the x intercepts of f (x) = - 16x^2 + 22x + 3

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  1. 26 August, 21:44
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    That is where the line crosses the x axis or where y=0

    0=-16x^2+22x+3

    we gon do grouping

    ac method

    -16 times 3=-48

    what 2 numbers multiply to get - 48 and add to get 22

    -2 and 24

    0=-16x^2-2x+24x+3

    group

    0 = (-16x^2-2x) + (24x+3)

    undistribute

    0=-2x (8x+1) + 3 (8x+1)

    undistribute

    0 = (8x+1) (-2x+3)

    set eaqual to 0

    8x+1=0

    8x=-1

    x=-1/8

    -2x+3=0

    3=2x

    3/2=x

    x intercepts ate x=-1/8 and x=3/2
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