Use your calculator to compute the actual roots.
Use the Quadratic Formula to solve x2 – 4x – 8 = 0.
x^2 - 4 x - 8 = 0
x = [ 4 +/- sqrt (16+32) ]/2
x = [ 4 +/- 4 sqrt 3 ] /2
x = 2 [1+/- sqrt 3 ]
Use the Quadratic Formula to solve x2 – 4x – 8 = 0.
x = [ 4 +/- sqrt (16+32) ]/2
x = [ 4 +/- 4 sqrt 3 ] /2
x = 2 [1+/- sqrt 3 ]