## Algebra and Trigonometry 10th Edition

y-4 , $y\ne-4$
Expression : $\frac{y^{2}-16}{y+4} = \frac{(y-4)(y+4)}{y+4}=y-4$ with y≠-4 as y=-4 would make the denominator in the original expression zero and division by 0 is not allowed.