Question

determine as raízes das equações abaixo​

Answer 1

Resposta:

$a) \\x^2 - 49 = 0\\x^2 = 49\\x = \sqrt{49} = \pm 7\\\\ b) \\2x^2 - 32 = 0\\2x^2 = 32\\x^2 = \frac{32}{2}\\x^2 = 16\\x = \sqrt{16} = \pm 4$

$c) \\5x^2 - 50 = 0\\5x^2 = 50\\x^2 = \frac{50}{5} \\x^2 = 10\\x = \sqrt{10} \\\\ d) \\2x^2 + 18 = 0\\2x^2 = -18\\x^2 = \frac{-18}{2} \\x^2 = -9\\x = \sqrt{-9} \\x = \pm 3i$