Question

Find the value of x in the equation:
x^2 + 4 = 12

Answer 1

`√(8) = 2 √(2)`

Explanation:

In the equation we must first move 4 to the other side and change its sign

x^2 + 4 = 12

x^2 = 12 - 4

x^2 = 8

Then we find x:

x =

`x = √(8) = √(2 * 2 * 2) = \sqrt{ {2}^(2) * 2 } = 2 √(2)`