Setting this expression = to 0 and then using the quadratic formula,
31 plus or minus sqrt( 961-4(10)(15) )
x = -------------------------------------------------------
20
31 plus or minus sqrt(361)
= --------------------------------------
20
31 plus or minus 19
= -----------------------------
20
40 or 12
= ----------------- = 2 or 6/10 or 2, 3/5
20
The graph is that of a parabola and it opens up. Zeros are x=2 and x=3/5.
31
Axis of symmetry is x = ----------
20
What else did you want to know, if anything? Next time, plese be sure to share all of the instructions.
