Question

gente pra amanhãaaaaaa​

Answer 1

Resposta:

a)

-x²+12x-20=0

x²-12x+20=0

x²-2*6*x+6²-6²+20=0

(x-6)²=6²-20

(x-6)²=36-20=16

(x-6)=±√16

x-6=±4

x=6±4

b)

x²+5x+6=0

x'=[-5+√(25-24)]/2=(-5+1)/2=-2

x''=[-5-√(25-24)]/2=(-5-1)/2=-3