Question

Resolva as equações
A) -9x² +12x-4=0
B) 7x+5+2x² =0
C) 9+x² -6x=0

Answer 1

a) -9x²+12x-4=0
→D=b²-4.a. c
→D=12²-4.(-9).(-4)
→D=144-144
→D=0

x½= -b±√D/2.a
x½= -12±0/2.(-9)
x½=-12±0/-18
x1= -12/-18
x2=-12/-18#
obrigado