How do you find the roots, real and imaginary, of y=x2121 using the quadratic formula?

1 Answer
Jun 8, 2018

The two solutions are 11 and 11

Explanation:

Compare your equation, x2121, with the generic equation ax2+bx+c. Your equation is obtained by choosing a=1, b=0, c=121.

The quadratic formula states that the solution of a quadratic equation are

x1,2=b±b24ac2a

Plug your coefficients:

x1,2=0±0241(121)21=±4842=±222=±11

So, the two solutions are 11 and 11