Subtract 1 from each side: x3 = 64;
You might know that 4 cubed is 64, but if you don't then take log 64, divide it by 3 and take the antilog of your answer...
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If: x3+1 = 65 Then: x3 = 65-1 And: x3 = 64 So: x = 4 by means of the cube root function on the calculator
IMPOSSIBLE
No.
It is x = -5
x3 + 2x2 - 8x + 5 = 0 x(2x - 8) + 5 = 0