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Value of X

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Value of X

by cartera » Thu Jan 29, 2009 7:41 am
284.If we know X^2 = X+1, what is X^ 3?

[spoiler]A: 2X+1[/spoiler]
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by krisraam » Thu Jan 29, 2009 7:50 am
x^2 = x + 1

x^2 * x = x^3 = x(x+1)
==> x^2 + x
==> x+1 + x ( substitute x^2 = x+1)
==> 2x +1


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