$\small $\frac{a^2+b^2}{a+b}$$.
$\small a- b$
$\small a+b$
Cannot be simplified
$\small \frac{a}{b}+\frac{b}{a}$
if $f(x) = $x^{2}$ + x - 2$ and g(x) = x - 3, solve f(g(x)).
$f(g(x)) = x^{2} + 2x - 5$
$f(g(x)) = x^{2} + x - 3$
$f(g(x)) = x^{2} - 5x + 4$
$f(g(x)) = x^{2} - 3$
$f(g(x)) = x^{2} + 1$
