4x^2+2x-1=0 in quaratic equations

Step-by-step explanation:

"quaratic" should be "quadratic."

The coefficients of this quadratic are 4, 2 and -1.  Thus, the discriminant is

b^2 - 4ac, or here, 4 - 4(4)(-1) = 20

Since the discriminant is positive, our quadratic has two real, different roots.

                                -2 ± (√4)(√5)

The roots are:  x =

                                       2(4)

                                    -1 ± √5

This reduces to   x =

                                           8

b is the answer that makes most sense

step-by-step explanation: