Question

Equacao (x + 1)(x - 1) = 2x como resolver

Answer 1

Resposta:

(a+1)*(a-1)=a²-1

(x+1)*(x-1)=2x

x²-1=2x

x²-2x-1=0

x'=[2+√(4+4)]/2 =(2+√8)/2 =1+√2³/2 =1+2√2/2 =1+√2

x''=[2-√(4+4)]/2 =(2-√8)/2 =1-√2³/2 =1-2√2/2 =1-√2