If that equals zero, then x = 4
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4 to the 3rd power simply means (4)x(4)x(4)= 64.
x3-5x2+x is already simplified.
4 to the 3rd power (also called 4 cubed) is 4 x 4 x 4 = 64
3-2 x 3-3 = 3-5 or 1/243
26= 2 x 2 x 2 x 2 x 2 x 2 = 64