Using Square Roots to Solve Quadratic Equations

Here's a handy table of perfect squares if you need an easy reference. Trust me though, soon you'll have many of these memorized!

Try some of these out on your own, and scroll down when you're complete to view the final answers.

1. x²+6 = 87

2. x²-7 = 71

3. 9x²+3 = 84

4. 5x²+7 = 132

5. Challenge: x(x²+4) = 40x

1. ±9

2. ±8

3. ±3

4. ±5

5. ±6