Chapter 1 - Section 1.3 - Algebraic Expressions - 1.3 Exercises - Page 34: 36

$r^2 - 4rs + 4s^2$

$Multiply$ $the$ $algebraic$ $expressions$ $using$ $a$ $Special$ $Product$ $Formula$ $and$ $simplify:$ $(r-2s)^2$ Use the Square of a Difference Product Formula: $(A-B)^2 = A^2 - 2AB + B^2$ $(r-2s)^2$ = $r^2 - (2\times r \times 2s) + (2s)^2$ $= r^2 - 4rs + 4s^2$