## anonymous 4 years ago I need help with this f(x)=2x^2+8x-8

1. lalaly

ok whats the question?

2. anonymous

graph each parabola and give its vertex,axis,x-intercepts,and y-intercept.

3. anonymous

x intercept set y=0 y intercept set x = 0 Vortex can be found by using the equation -(2b/a) = x where a = 2 b = +8 in this case, to find the y value sub the x value you get from that equation and you have your vortex To graph just make a table of x values to from -3 to +3 and sub them into the function to see what y values you get then graph the points and intercepts

4. anonymous

use quadric formula solve$\frac{-b \pm \sqrt{b^2-(4*a*c)}}{2*a}$a=2 b=8 c=-8

5. anonymous

You would use the quadratic formula to solve the x intercepts

6. anonymous

also whenever dealing with the quadratic formula solve what is in the radical first, dont just punch all that stuff into your calculator

7. anonymous

ok thanks guys

8. anonymous

How i can write ± in my calculator???

9. anonymous

u dont

10. anonymous

ok I will try

11. anonymous

solve it algebraically don't use your calculator

12. anonymous

Finally I got it Thanks guys