Problem 128
Factor each expression completely. $$2 x^{3} z-4 x^{2} z+32 x z-64 z$$
Problem 129
Explain how you would write a trinomial in descending order.
Problem 137
When we add \(5 x\) and \(7 x\), we combine like terms: \(5 x+7 x=12 x\). Explain how this is related to factoring out a common factor.