Question

x equacao do 2 +x-7-5

Answer 1

x² +x -7 = 5
x² +x -7 -5
x² +x -12
Δ= b²-4ac
Δ= 1²-4.1.(-12)
Δ= 1 + 48
Δ= 49

x= -b +/- √Δ / 2a
x= -1 +/- √49 / 2.1
x'= -1 +7 / 2
x'= -6/2
x'= -3

x''= -1 -7 /2
x''= -8/2
x''= -4


Bons estudos!

Answer 2

$x^{2}+x-7-5=0 \\ x^{2}+x-12=0, a=1,b=1,c=-12 \\ delta=b^{2}-4.a.c \\ delta=1+48=49 \\ x_{1}= \frac{-b+\sqrt{delta}}{2a} \\ x_{1}= \frac{-1+7}{2}= \frac{6}{2}=3 \\ x_{2}= \frac{-1-7}{2}= \frac{-8}{2}=-4 \\ V=3 e-2$