Question

How do you solve `5 - x^2 = 20`?

Answer 1

`x = -3.873`

Explanation:

`5-x^2 = 20`

`-x^2 = 20-5`

`-x^2 = 15`

`-x = sqrt15`

`-x = 3.873`

`color(blue)(x = -3.873`

We can now prove our answer by substituting `x` for `-3.873`

`5-x^2 = 20`

`5- -3.873^2 = 20`

`5 + 3.873^2 = 20`

`5 + 15 = 20`