Difference of two cubes: a3 - b3 = (a-b)(a2+ab+b2)
125 - x3
=
53 - x3
=
(5 - x)(52 + 5x + x2)
=
(5 - x)(25 + 5x + x2)
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(x - 5)(x^2 + 5x + 25)
x^3=125 x=5
Yes 125 is a cubed number it is 53 (5 x 5 x 5)
5 * 7 * x * x * x
The answer to 53 - that is, five cubed, is equal to 5 x 5 x 5 = 125.