Question

(x+2)+(x-1)²=x+1 qual a resposta por favor preciso de conta

Answer 1

(x +2) + (x -1)² = x +1

x + 2 + x² -2x + 2 = x +1

-x + 4 + x² = x + 1

-2x + x² + 3 = 0

x² - 2x + 3 = 0

Δ= 2² - 4. 4. 1. 3

Δ= 4 - 12

Δ= -8 ⇒ não existe nos reais.

Answer 2

$(x+2)+(x-1)^{2}=x+1\\ \\produto~notavel:~~(x-1)^{2}=x^{2}-2.x.1+1^{2}=x^{2}-2x+1\\\\x+2+x^{2}-2x+1-x-1=0\\\\x^{2}+x-x-2x+1-1=0\\\\x^{2}-2x=0\\\\x(x-2)=0\\\\x'=0\\\\x''-2=0\\\\x''=2\\\\S=(x'=0;~~x''=2)$