Answer:
[tex]\frac{y -14\sqrt{y} +49}{y-49}[/tex]
Step-by-step explanation:
1. multiply by a fraction with just the denominator but the opposite sign in between
[tex]\frac{\sqrt{y}-7 }{\sqrt{y}+7 } *\frac{\sqrt{y}-7 }{\sqrt{y}-7 }[/tex]
2. multiply the 1st numerator by the other numerator and the 1st denominator by the other denominator
[tex]\frac{(\sqrt{y}-7) (\sqrt{y}-7) }{(\sqrt{y}+7) (\sqrt{y}-7)}[/tex]
3. the numerator simplifies to [tex](\sqrt{y} -7)^2[/tex] and the denominator to y-49
4. expand the numerator and you should get the answer
