Question

valor da espressao 0=X²+2x-1​

Answer 1

Resposta:

$0=x^2+2x-1\\x^2+2x-1=0\\a= 1 |\; b=2\; | \; c=-1\\\\\Delta=2^2-4.1.(-1)\\\Delta=4-4.(-1)\\\Delta=4+4\\\Delta=8\\\sqrt8=2,8\\\\x=\frac{-2\pm\sqrt8}{2.1}\\x=\frac{-2\pm2,8}{2}\\\\x'=\frac{0,8}{2}=0,4\\x''=\frac{-4,8}{2}=-2,4$

Fórmula do Delta: $\Delta=b^2-4ac$

Fórmula de Bhaskara: $\frac{-b\pm\sqrt\Delta}{2a}$