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Given x square + 5x-990 = 0, find the value of X cube-6x square-985x-1010
Wrong, it is X & # 179; + 6x & # 178; - 985x-1010, that is, X & # 178; + 5x = 990, so the original formula = x & # 179; + 5x & # 178; + X & # 178; - 985x-1010 = x (X & # 178; + 5x) + X & # 178; - 985x-1010 = 990x + X & # 178; - 985x-1010 = x & # 178; + 5x-1010 = 990-1010 = - 20
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