How do I find the cube of $(2 x + 5)$ ?

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Answer 1 · 2018-04-01T02:09:25

$8x^3+65x^2+150x+125$

$(2x+5)$ cubed = $(2x+5)^3$

$(2x+5)^3 = (2x+5)(2x+5)(2x+5)$

First, do $(2x+5)(2x+5)=4x^2+20x+25$

Now do the second part: $(4x^2+20x+25)(2x+5)$

$8x^3+65x^2+150x+125$

How do I find the cube of (2 x + 5)(2 x + 5)?