Question

Resolva as equações abaixo

a) x(x+1)=2x
b) 3(x²-5)+4=22
c) (x-4)²+2x=16
d) (3-x).(x+7)=3-4x
e) (5+2x)²=20x

Answer 1

a) x2+x-2x=0
x2-x=0
x(x-1)=0
x’=0
x’’=1

b) 3x2-15+4-22=0
3x2=33
x2=33/3
x= raiz de 11

c) x2-8x+16+2x-16=0
x2-6x=0
x(x-6)=0
x’=0
x’’=6