Question

Use the quadratic formula to solve the equation x^2+2x-1=0?

Answer 1

a = 1
b = 2
c = -1

substitute them into formula

Answer 2

\[x = \frac{-b \pm \sqrt{b^{2}-4ac}}{2a}\]

Answer 3

find b^2-4ac in the general form of quadritic equation i.e. ax^2+bx+c=0

Answer 4

that seems the roots of the equations would be imaginary ones

Answer 5

Okay, so I got -2+or-sqrtof eight/2. Now what?

Answer 6

I/m sorry the two roots are real

Answer 7

x1= -1+sqrt(2)

Answer 8

x2=-1-sqrt(2)

Answer 9

@poffdiddy
you can factor out a 2
-> sqrt(8) = 2sqrt(2)

-> 2(-1 +- sqrt(2))/2 = -1 +- sqrt(2)