Question

Which equations are true for x = –2 and x = 2? Select two options x2 – 4 = 0 x2 = –4 3x2 + 12 = 0 4x2 = 16 2(x – 2)2 = 0

Answer 1

x² - 4 = 0

4x² = 16

Explanation:

x² - 4 = 0 can be rewritten as
x² = 4

x = ± √4

x = ± 2

So this gives two solutions for x => x = 2 and x = -2

4x² = 16

Divide by 4 both sides

x² = 16/4

x² = 4

which is the same as above

x = ± 2