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10 January, 21:50

If f (x) = 2x^2 - 3x + 4, then f (x + 3) is equal to

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  1. 10 January, 22:04
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    f (x + 3) = 2x² + 9x + 13

    substitute x = x + 3 into f (x)

    f (x + 3) = 2 (x + 3) ² - 3 (x + 3) + 4 = 2 (x² + 6x + 9) - 3x - 9 + 4

    f (x + 3) = 2x² + 12x + 18 - 3x - 9 + 4 = 2x² + 9x + 13
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