Answer
$x^{2}+7x+2$
Work Step by Step
The standard form of a polynomial is
$a_{n}x^{n}+a_{n}x^{n-1}+\cdots+a_{1}x+a_{0}$
(written in order, highest degree first. If a term is missing, it means that the coefficient is 0).
Taking down the parentheses, the given expression simplifies to:
$= x^{2}+4x+5+3x-3\qquad $
Combine like terms:
$=x^2 + (4x+3x)+(5-3)
\\=x^{2}+7x+2$
