find the x intercepts of
y=2x^2-8x-7
using completing the square technique
Find x intercepts of
y=3x^2-9x+5
using the quadratic formula
First please note that the x-intercepts of the quadratic function are the roots of the corresponding quadratic equation. So for these two questions:
1) solve x for 2x^2-8x-7=0 using completing square technique
$\displaystyle 2(x^2-4x+4)-7=8\Rightarrow 2(x-2)^2=15\Rightarrow x=2\pm \frac{\sqrt{30}}{2}$
2) See Mathstud28 comments
Roy
No, I think you are too sensitive here. When I were typing my original response, I saw you just post your reply and I don't want to retype the quadratic formula , this is why i just type please see your comment for part (2). I have no intention to imply that your comment on (1) is not correct.
We are all here to learn and help.
Roy