x^3-144x=?
\text{ a. }x(x-12)^2
\text{ b. }x(x+12)^2
c. x(x-12)(x+12)
d. none of these
let us consider \left(x^{3}-144 x\right)=x\left(x^{2}-144\right.) by taking x as the common factor
By using the formula a^{2}-b^{2}=(a-b)(a+b)
= x (x – 12) (x + 12)
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