. Question 15 5 Find the approximate value of / ( - x2) dx using the trapezoidal rule with four subdivisions. Draw a graph to illustrate. The estimated value is: Give your answer accurate to four decimal places. This answer is an: O under estimate O over estimate Explanation of answer above: O because the function is concave up because the function is decreasing O because the function is concave down O because the function is increasing Question Help: Video 1 ) Video 2 Submit