Question

Solve the equation by using square roots. 2 x 2 − 9 = 11

Answer 1

x = ±
`√(10)`

Explanation:

Given

2x² - 9 = 11 ( add 9 to both sides )

2x² = 20 ( divide both sides by 2 )

x² = 10 ( take the square root of both sides )

x = ±
`√(10)` ← exact solutions