Resposta :
Usa-se de bascara
6² - 4.9.(-48)
1764
(-6 +- V1764)/18
-6+- 42/18
x1= -48/18 = -2,6...
x2= 36/18 = 2
Espero ter ajudado =)
Olá!!!
Sabemos que:
a=9
b=6
c=-48
Basta usar baskara
[tex]x=\frac{-b\frac{+}{}\sqrt{b^2-4.a.c}} {2.a}\\ \\ x=\frac{-6\frac{+}{}\sqrt{6^2-4.9.(-48)}} {2.9}\\ \\ x=\frac{-6\frac{+}{}\sqrt{36-36.(-48)}} {18}\\ \\ x=\frac{-6\frac{+}{}\sqrt{36-(-1728)}} {18}\\ \\ x=\frac{-6\frac{+}{}\sqrt{1764}} {18}\\ \\ x=\frac{-6\frac{+}{}42} {18}\\ \\ x^1=\frac{-6+42}{18}=2\\ \\ x^2=\frac{-6-42}{18}=-2,66... [/tex]