## Algebra: A Combined Approach (4th Edition)

$\dfrac{49-y^{2}}{y-7}=-y-7$
$\dfrac{49-y^{2}}{y-7}$ Factor the numerator: $\dfrac{49-y^{2}}{y-7}=\dfrac{(7-y)(7+y)}{y-7}=...$ Change the sign of the denominator. To do so, also change the sign of the fraction. After that, simplify: $...=-\dfrac{(7-y)(7+y)}{7-y}=-(7+y)=-y-7$