## Precalculus: Mathematics for Calculus, 7th Edition

$25-y^2$
$Multiply$ $the$ $algebraic$ $expressions$ $using$ $a$ $Special$ $Product$ $Formula$ $and$ $simplify:$ $(5-y)(5+y)$ Use the Sum and Difference of Same Terms Product Formula: $(A+B)(A-B) = A^2-B^2$ $(5-y)(5+y) = 5^2-y^2$ $=25-y^2$