Question

Determine as raízes reais da equação incompleta de tipo a X2 + C = 0 c)5x2-20=0

Answer 1

$5x^2 - 20 = 0\\5x^2 = 20\\x^2 = \dfrac{20}{5}\\x^2 = 4\\x = \pm\sqrt4\\\\ S=\{-2, \ 2\}$

As raízes são -2 e 2.