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x^4+3x^3-x^2+6 for x=-3

-3^4+3x-3^3-(-3^2)+6

-81+3x-3^3-(-3^2)+6

81+-24=57

1 answer

-3^4 + 3 * -3^3 - (-3)^2 + 6 =
81 - 81 - 9 + 6 = -3.