8. write the quadratic formula
if a = 1, b = -2, and c = -8, find the roots of the quadratic equation.

 Formula= x^2 - 2x - 8

Roots=(-2 , 0) (4 , 0)

Step-by-step explanation:

1.) find the equation (the formula is Ax^2 + Bx + C, so plug it in)

2.)Plug it into your calculator's Y= X^2 - 2X - 8 (if you have one)

3.)Press 2nd, Calc, 2

4.)Go to the X Intersect , it will say Left Bound at the bottom left corner

5.)Press the left arrow about 3 or 4 times, hit enter

6.) It will now say Right Bound in the same corner go back to the X intersect, now press the right arrow 3 or 4 times

Repeat steps 3 to 6 for the other X intersect.  

step-by-step explanation:

through just a quick inspection, one can see that the graph of this cubing function starts in quadrant iii and ends in quadrant i.   when x = 0, y = 3, so the y-intercept is (0, 3).

if graphs are part of the problem statement, share them.   .