Precalculus: Mathematics for Calculus, 7th Edition

$49^2-28y + 4$
$Multiply$ $the$ $algebraic$ $expressions$ $using$ $a$ $Special$ $Product$ $Formula$ $and$ $simplify:$ $(2-7y)^2$ Use the Square of a Difference Product Formula: $(A-B)^2 = A^2-2AB+B^2$ $(2-7y)^2$ = $2^2-(2\times2\times7y) + 7y^2$ $=4 - 28y + 49^2$ $=49^2-28y + 4$