Question

Como resolver : -20 = -x -x² ?

Answer 1

-20 = -x -x²

-20+x+x^2=0


x^2+x=20

x^2+x+1/4=20+1/4

(x+1/2)^2=40.20+1/4

(x+1/2)^2=81/4

x+1/2=√81/4

x+1/2=9/2

x=9/2-1/2

x=9-1/2

x=8/2

x=4

x'+x"=-b/a


x'+x"=-(+1)/1

x'+x"=-1

x"=-1-x"

x"=-1-4

x"=-5

s={-5;4}


espero ter ajudado!

boa tarde!