The commutative law of multiplication.
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X3-5=3 X3=3+5 X3=8 cube root of X3=cube root of 8 X=1.68 I hope this could help. There's not really any good ways to write algebra in a normal text box.
x3 + 2x2 - 8x + 5 = 0 x(2x - 8) + 5 = 0
Let y = x3 - 8, then y' = 3x2 + 0 = 3x2.
3 x 3 + 4 x 8 = 9 + 32 ...
x3 + 8 = x3 + 23 = (x + 2)(x2 + 2x + 22) = (x + 2)(x2 + 2x + 4)