Question

EQUAÇÕES DE SEGUNDO GRAU - INCOMPLETAS​

Answer 1

Resposta:

a)x²-7x=0

x( x -7)=0

x=0

x-7=0

x=7

b)x²+5x=0

x(x+5)=0

x=0

x+5=0

x= -5

c)4x²-9x=0

x(4x-9)=0

x=0

4x- 9=0

x=9/4

d)3x²+5x=0

x(3x+5)=0

x=0

3x+5=0

x= -5/3

e) x² +x(x-6)=0

x²+x²- 6x=0

2x² -6x=0

2x(x - 3)=0

x=0

x-3=0

x=3

f)(x+1)(x-3)=-3

x²-2x -3=-3

x²-2x=0

x,(x -2)=0

x=0

x- 2=0

x=2

g)2x²- 50=0

2x²=50

x²=50/2

x=V25

x= +- 5

h)7x²-7=0

7x²=7

x²=7/7

x=V1

x=+-1

i)9x²-5=0

9x²=5

x²=5/9

x= +- V5/3