$f\left(x\right)=\frac{x^2}{x^4+16}$
$f\left(x\right)=2x-4$
$f\left(x\right)=\frac{1}{x\sqrt{x}}$
$f\left(x\right)=\left(4x+1\right)\left(6x+3\right)$
$f\left(x\right)=\frac{1}{\left(1+x\right)^2}$
$f\left(x\right)=x^2-4x$
An algebraic expression is a group of terms that are separated by $+$ or $-$ signs.
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