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3 May, 22:46

If f (x) = 4x²+8x-9 find and simplify f (2+x)

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  1. 4 May, 01:08
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    4x² + 24 x + 23

    Step-by-step explanation:

    f (x) = 4x² + 8x - 9

    f (2+x) = 4 (2+x) ² + 8 (2+x) - 9

    = 4 (2²+2.2x + x²) + 16 + 8x-9

    = 16 + 16x + 4x² + 16+8x-9

    =23+16x+4x²+8x

    = 4x² + 24x+23

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