Question

Como resolvo essa equacao
x(x-2)=x²-4x ?

Answer 1

ax² + bx + c = 0 
► 
► a = 1 
► b = -4 
► c = 3 
► 
► ∆² = b² - 4ac = (-4)² - 4.1.3 = 16 -12 = 4 
► ∆ = 2 
► 
► x' = -b/2a + ∆/2a = 4/2 + 2/2= 3 
► x" = -b/2a - ∆/2a = 4/2 - 2/2 = 1 
► 

Answer 2

x(x-2)=x²-4x
x.x-2.x=x²-4x
x²-2x=x²-4x
x²-x²=-4x-2x=> -2x