# How do you solve using the quadratic formula #x^2+3x-4=0#?

##### 1 Answer

May 16, 2015

You can use shortcut. Don't use quadratic formula.

Reminder:

When a + b + c = 0, one real root is (1) and the other is (c/a).

When a - b + c = 0, one real root is (-1) and the other is (-c/a)

Two real roots: 1 and -4 (c/a = -4)