Calculus Area between curve and x-axis: curve y=a+bx+cx^2 drawn through (-h,y_1),(0,y_2),(h,y_3); find a,b,c in terms of y_1,y_2,y_3,h, and...

[lookagain]

... answer should be h/3(4y2+y1+y3)

In this horizontal style, you would use the underscore as mentioned in post #8:

(h/3)(4y_2 + y_1 + y_3).

Or, notice how it was written as the last expression in post #17 in the Latex format.
The subscripts sit slightly below the line that the variables sit on.