The following figure shows the graph of `f(x)= ax^(2)+ bx+c`, find the sign of `a, b and c`.

The following figure shows the graph of `f(x)= ax^(2)+ bx+c`, find the

1.	The following figure shows the graph of `f(x)= ax^(2)+ bx+c`, find the sign of `a, b and c`.
Answer» Fromt the graph, `f(0)= c gt 0` (as the graph intersects the y-axis on the positive side) Also the graph is concave downwards, so `a lt0`. Further, the vertex lies on the right-hand side of y-axis, so the abscissa of the vertex is `-(b)/(2a) gt 0 rArr b gt ` (as ` alt0`).