Question

R ao quadrado menos 16 igual a zero

Answer 1

R² - 16 = 0

R² = 16

R = √16

R = 4

Answer 2

${r}^{2} - 16 = 0 \\ {r}^{2} = 0 + 16 \\ {r}^{2} = 16 \\ r = \sqrt{16} \\ r = 4$