# Chapter 5 - Mid-Chapter Check Point: 20

y$^2$-12yz+36z$^2$

#### Work Step by Step

Follow the special product rule of perfect squares where (a+b)$^2$=a$^2$+2ab+b$^2$ (y-6z)$^2$ (y)$^2$+2(y)(-6z)+(-6z)$^2$ y$^2$-12yz+36z$^2$

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