Take out the common factor which is $\displaystyle a^{\frac{1}{2}}$
$\displaystyle a^{\frac{1}{2}}(a+2)$ which is similar the ans given.
is $\displaystyle a^{\frac{1}{2}}$ the common factor because there are 2 $\displaystyle a^{\frac{1}{2}}$s?
and
would it still be the same answer it it was $\displaystyle \sqrt a(a+2)$ rather than $\displaystyle (a+2)\sqrt a$
is $\displaystyle a^{\frac{1}{2}}$ the common factor because there are 2 $\displaystyle a^{\frac{1}{2}}$s?
and
would it still be the same answer it it was $\displaystyle \sqrt a(a+2)$ rather than $\displaystyle (a+2)\sqrt a$