You can drag the values to adjust a, b, and c; you may also enter a value for c directly into the input box.
Find the value of [math]c[/math] at which the instantaneous rate of change in [math]f\left(x\right)=-2x^2+16x-27[/math] is equal to the average rate of change over the interval [math]\left[4,6\right][/math].