###### Example7.4.2

Expand the expression \((px+q)(rx+s)\) and analyze the result to gain an insight into *why* the AC method works. Then use this information to factor \(4x^2+5x-6\text{.}\)

Expand the expression \((px+q)(rx+s)\) and analyze the result to gain an insight into *why* the AC method works. Then use this information to factor \(4x^2+5x-6\text{.}\)