The correct answer is: x = [tex] \pm 4 [/tex]
Explanation:
Given equation:
[tex] 4x^2 = 64 [/tex]
Divide both sides by 4:
[tex] \frac{4x^2}{4} =\frac{64}{4} \\ x^2 = 16 [/tex]
Take square-root on both sides:
[tex] \sqrt{x^2} = \sqrt{16} \\ x = \pm4 [/tex]
Hence the correct answer is: x = [tex] \pm 4 [/tex]
