Question

21=7×ao quadrado como resolver

Answer 1

Oi =)

7x² = 21
x² = 21/7
x² = 3
x = $\sqrt{3}$

x = +/- $\sqrt{3}$

Answer 2

21 = 7x^2

x^2 = 21/7

x^2 = 3

x = + -√3

x = +-1.73205080808