What is the Quadratic Formula? | Printable Summary

A quadratic equation must be set equal to 0 before you can use the quadratic formula
Since there is a plus and minus sign in the equation, we need to split it into two equations to solve

1. The quadratic formula can be used to find the solutions to a quadratic equation
2. If you can't solve a quadratic equation an easier way, you can always use the quadratic formula to find the answers
1. This quadratic equation is equal to 0, so we can use the quadratic formula to solve
2. a is the coefficient in front of x², which is 1
3. b is the coefficient in front of x, which is 3
4. c is the constant on the end, which is -4
5. Since there is a plus and minus sign in the equation, we need to split it into two equations to solve
1. The solutions we got were x=1 and x=-4
2. We need to plug both of our solutions into x²+3x-4 to see if we get 0