Question

04) Determine o conjunto solução de cada uma das uma das seguintes equações do 2º
grau a seguir: 4,0
a) 2x2 - 18 = 0
b) 3y2 - 12 = 0
C) y2 + 25y = 0
d) x2 + 9x = 0​

Answer 1

Resposta:

$2x2 - 18 = 0\\\\4x-18=0\\\\4x-18+18=0+18\\\\4x=18\\\\\frac{4x}{4}=\frac{18}{4}\\\\x=\frac{9}{2}$

$3y2 - 12 = 0\\\\6y-12=0\\\\6y-12+12=0+12\\\\6y=12\\\\\frac{6y}{6}=\frac{12}{6}\\\\y=2$

$y2 + 25y = 0\\\\27y=0\\\\\frac{27y}{27}=\frac{0}{27}\\\\y=0$

$x2 + 9x = 0\\\\11x=0\\\\\frac{11x}{11}=\frac{0}{11}\\\\x=0$