# Chapter 5 - Review: 47

8$x^{2}$ + 2b - 22

#### Work Step by Step

(3$x^{2}$ - 4b+ 28) + (9$x^{2}$ - 30) - (4$x^{2}$ - 6b + 20) = 3$x^{2}$ - 4b+ 28 + 9$x^{2}$ - 30 - 4$x^{2}$ + 6b - 20 = 8$x^{2}$ + 2b - 22

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