Question

Solve the equation below for the exact values of 4x2-5=75 ​

Answer 1

x = ± 2
`√(5)`

Explanation:

Given

4x² - 5 = 75 ( add 5 to both sides )

4x² = 80 ( divide both sides by 4 )

x² = 20 ( take the square root of both sides )

x = ±
`√(20)`

= ±
`√(4(5))`

= ± 2
`√(5)`