Question

How do you solve `2x^2 - 8 = 0`?

Answer 1

The solutions are
`color(blue)(x=2, x=-2`

Explanation:

`2x^2-8=0`

Here `2` is common to both terms of the expression:
`2(x^2-4)=0`

`x^2-4=0`
`x^2=4`
`color(blue)(x=+-2`