What is the positive solution to the equation 0 = –x2 + 2x + 1? quadratic formula: x =
a) –2 + /2
b) 2 - /2
c) 1 + /2
d) - 1 + /2

To solve the roots of a quadratic equation, you use the quadratic formula:



for a quadratic equation with a general equation:



Hence, for this problem, a = -1, b = 2 and c=1. The roots would be 2.414 and -0.414. Thus, the positive root is 2.414. There must be something wrong with your given or the choices. Just follow my given example for your guidance. 

Thank you for posting here on . Hope I was able to help.

We need more info then that