Question

What is the positive solution to the equation 0 = –x2 2x 1

Answer 1

Answer:C

Explanation:

Answer 2

`0=-x^2+2x+1\\x^2-2x-1=0\\x=(-(-2)\pm√((-2)^2-(4*1*-1)))/(2*1)\\=(2\pm√(4+4))/(2)\\=(2\pm2√(2))/(2)\\=1+√(2) \ or \ 1-√(2)`

Therefore, the positive solution is
`1+√(2)`