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x = -2
-(-2)^5 + (-2)^3 - (-2)^2 + 10 * (-2) = 32 - 8 - 4 - 20= 0
x = √2
-(√2)^5 + (√2)^3 - (√2)^2 + 10 * √2 = - 4√2+2√2 -2 +10√2= 8√2 - 2