Answer
$5x(2x-1)(2x+1)$
Work Step by Step
Factor out $5x$ to obtain:
$=5x(4x^2-1)$
Write $4x^2$ as $(2x)^2$ to obtain:
$=5x[(2x)^2-1]$
The binomial is a difference of two squares.
RECALL:
A difference of two squares can be factored using the formula:
$a^2-b^2=(a-b)(a+b)$
Factor the difference of two squares using the formula above with $a=2x$ and $b=1$ to obtain:
$=5x(2x-1)(2x+1)$
