Question

Determine as raízes da função abaixo:
2x2 - 26x + 84 = 0
x = 8; x = 18
x = 3; x = 2
x = 6; x = 7
x = 11; x = 17

Answer 1

Resposta:

$2x2 - 26x + 84 = 0\\\\4x-26x+84=0\\\\-22x+84=0\\\\-22x+84-84=0-84\\\\-22x=-84\\\\\frac{-22x}{-22}=\frac{-84}{-22}\\\\x=\frac{42}{11}\\\\x=3\\\\ x=2$