Find the derivative of (2x+3)(5x2-7x+1)
Let       f(x) =   (2x+3)(5x2-7x+1)
    Â
                                                             (Byn Product rule)
               = (2x+3) (10x-7)+(5x2 -7x+1)(2)
               Â
               = 20x2 -14x + 30x -21 + 10x2 -14x + 2
               = 30x2 + 2x - 19