Question

Resolva as equações do segundo grau:
1)-x ao quadrado+x+12=0

Answer 1

-x²+x+12=0

a= -1
b= 1
c= 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
X¹=-1+7\-2=6\-2=-3
X²=-1-7\-2=-8\-2=4




Bons estudos no brainly !!!:-) :-) :-)

Answer 2

-x²+x+12=0
Multiplique por (-1)
x²-x-12=0
Aplicando Bhaskara:
x=[-b+ou-Vb²-4ac]:2a
x=[-(-1)+;ou-V(-1)²-4*1(-12)]:2*1
x=[1+ou-V49]:2
x=[1+ou-7]:2

Resolvendo:
x'=[1+7]:2
x'=8/2
x'=4

x"=[1-7]:2
x"=-6/2
x"=-3