Question 1002510
ax^2+bx+c=0
c=6, using the first point.
4a+2b+6=14
4a+2b=8
2a+b=4
16a+4b+6=-2
16a+4b=-8
4a+b=-2
-2a-b=-4, negating the first
2a=-6, adding
a=-3
b=10
-3x^2+10x+6=0

{{{graph(300,200,-10,10,-10,20,-3x^2+10x+6)}}}