Question

resolver as equações x²-2x=0 , x²-6x=0, x²+5x=0, x²=16

Answer 1

x² - 2x = 0
x ( x - 2) = 0
x = 0 ****
x - 2 = 0
x = 2 ****

x² - 6x = 0
x ( x - 6) = 0
x = 0 ***
x - 6 = 0
x = 6 ****

x² + 5x = 0
x ( x + 5 ) = 0
x = 0
x + 5 = 0
x = - 5 ****

x² = 16
Vx² = +-V16
x = +-4 ***

Answer 2

x2-2x=0
x.(x-2)=0
x=0 
x-2=0
x=2
x2-6x=0
x.(x-6)=0
x=0
x-6=0
x=6
x2+5x=0
x.(x+5)=0
x=0
x+5=0
x=-5
x2=16
x=raiz quadrada de 16=4