Question

2. Solve. x2 - 72 = 0

Answer 1

Answer:

x = ± 6$\sqrt{2}$

Step-by-step explanation:

Given

x² - 72 = 0 ( add 72 to both sides )

x² = 72 ( take the square root of both sides )

x = ± $\sqrt{72}$ = ± $\sqrt{36(2)}$ = ± 6$\sqrt{2}$

Answer 2

x² - 72 = 0

x² = 72

x = √72

x = √2×36

x = √2×6²

x1 = 6√2

x2 = - 6√2