Jon P. answered 02/20/15
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-5x3 + 9x2 - 8x - 2 when x = -2...
-5(-2)3 + 9(-2)2 - 8(-2) - 2 =
(-5)(-8) + 9(4) + 16 - 2 =
40 + 36 + 16 - 2 =
90