# What is the standard form of y=(2x+4)(x-4)(2x+1)?

What is the standard form of y=(2x+4)(x-4)(2x+1)?
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Explanation:
the standard form of a polynomial of degree 3 is
$y=a{x}^{3}+b{x}^{2}+cx+d;a\ne 0$
Expand the factors and collect like terms
$=\left(2x+4\right)\left(2{x}^{2}-7x-4\right)$
$=4{x}^{3}-14{x}^{2}-8x+8{x}^{2}-28x-16$
$=4{x}^{3}-6{x}^{2}-36x-16←$ in standard form