# Chapter R - Section R.5 - Polynomials - R.4 Assess Your Understanding - Page 49: 85

$x^2-4xy+4y^2$

#### Work Step by Step

$(x-2y)^2$ The book tells us to use the special product formulas to solve the problem. In order to do so, we must refer to these formulas: $(a + b)^2 = a^2 + 2ab + b^2$ $(a – b)^2 = a^2 – 2ab + b^2$ Now, we can rewrite our expression as: $x^2-4xy+4y^2$

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