Question

Resolva as equações incompletas do segundo grau em R

1 ) 3x²+21x= 0

2) (x+5)(x-5)=11

3) x-6=(x-2) (x+3)

4) (3x+1)²=2(3x-4)

Answer 1

1)3x(x+7)=0
x=0/3=0
x+7=0
x=-7

2) x²-5x+5x-25=11
x²-25=11
x²= 11+25
x²= 36
x= √36=6

3) x-6= x²+3x-2x-6
-x²+x-3x+2x= 6-6
-x²=0
x=0

Answer 2

Resposta:

1)3x(x+7)=0

x=0/3=0

x+7=0

x=-7

2) x²-5x+5x-25=11

x²-25=11

x²= 11+25

x²= 36

x= √36=6

3) x-6= x²+3x-2x-6

-x²+x-3x+2x= 6-6

-x²=0

x=0

Explicação passo-a-passo: