Question

2) Solve, do not use quadratic formula4x²+7x-15=0

Answer 1

This time, you can use different methods to solve the quadratic expression

Let's use factoring to solve this equation.

`\begin{gathered} (4x)^2+7(4x)-60=0 \\ (4x+12)(4x-5)=0 \\ 4x+12=0 \\ 4x=-12 \\ x=-(12)/(4) \\ x=-3 \\ 4x-5=0 \\ 4x=5 \\ x=(5)/(4) \end{gathered}`

The solutions of this expression are x=-3 and x=5/4.

Other method you can use instead of quadratic formula is the graphing method. You graph the expression on a graphing calculator and the x intercepts of the graph are the solutions of the expression.