Ok so in a non calculator (mental) practice question. I've been given a quadratic equation in the form $y = ax^2 + bx + c$:
$y= 2 + 1.75x - 0.25x^2$
After rearranging and changing the decimals to fractions I end up with:
$y = (-1/4)x^2 + (7/4)x + 2$
I'm then asked to determine the equation of the line of symmetry (LOS) and then the coordinates of the x-intercepts. To work out the LOS, I used the formula $-b/(2a)$ and my answer was $x= 28/8$ ($3.5$). However I don't think this answer is correct and I also don't know how to get the x-intercepts from this.
If anyone could explain (in simple steps) how to get the right answers it would be helpful.
I graphed it on my calculator (even though i'm not supposed to) and it looks like the x-intercepts are near $-1$ and $8$ according to Wolfram Alpha.