One equation with two unknowns usually does not have a solution.
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It is x = -5
IMPOSSIBLE
No.
x3 + 2x2 - 8x + 5 = 0 x(2x - 8) + 5 = 0
If: x3+1 = 65 Then: x3 = 65-1 And: x3 = 64 So: x = 4 by means of the cube root function on the calculator