What real value of produces the smallest value of the quadratic t^2 - 9t - 36 + 7t - 20?
t^2 -2t -56 will have a minimum value at t = - b/2a where a = 1 and b = -2 you can finish....
(the minumum value produced will be found by sub'ing into the equation the value of 't found above)
