Question

How do you solve `3x² + x – 2 = 0`?

Answer 1

-1 and `2/3`

Explanation:

Since a - b + c = 0, use shortcut.
The 2 real roots are: -1 and (-c/a = 2/3).

REMINDER OF SHORTCUT
- When a + b + c = 0, there are 2 real roots: 1 and `c/a`
- When a - b + c = 0, there are 2 real roots: -1 and (-c/a).
Remember this shortcut. It will save you a lot of time and effort.