Question

Find the solutions to the equation below: x^2-9=0

Answer 1

X=3, or -3

Explanation:

3^2=9

9-9=0

-3^2=9

9-9=0

Answer 2

For this case we must solve the following equation of the second degree:

`x ^ 2-9 = 0`

We add 9 to both sides of the equation:

`x ^ 2-9 + 9 = + 9\\x ^ 2 = 9`

We apply square root on both sides of the equation:

`\sqrt {x ^ 2} = \sqrt {9}\\| x | = \sqrt {9}\\x = \pm \sqrt {9}\\x = \pm3`

Answer:

`x = \pm3`

The solutions are:

`x=3\ and\ x=-3`