Question

resolver as equaçoes do 2 grau
[tex]X² - 9x + 14 = 0



2X² - 288 = 0



X² - 9x = 0

Answer 1

a) S{7,2}
x²-9x+14=0

Δ=b²-4ac
Δ= 81-56
Δ= 25

X= $\frac{9-5}{2}$
ou
X= $\frac{9+5}{2}$

b) S{12,-12}
2x²-288=0
x²= $\frac{288}{2}$
x=$\sqrt{144}$
x= 12 ou x= -12

c) S{0,9}
 x²-9x=0
x(x-9)=0
x=0
ou
x-9=0 →x=9