[填空题]
A curve y=f(x) has a gradieldd: v/qwf9cgrksy/8g 6g5e 2ntf,nnva ut mgg3 egke7 06*4ln) 7q29ppubx fe2 function of f^{\prime}(x)=a x+1 . The diagram below shows part of the curve, with the x and y intercepts labelled.
1. Find the equation of the curve is y=-ax$^2$+bx+c; a= ,b= ,c= .
2. Find the area under the curve from 0A=$\frac{a}{b}$units$^2$,a= ,b= .