Approximate the area under the graph of f(x) = 0.04x^4 - 2.89x^2 + 86 over the interval [4,12] by dividing the interval into 4 subintervals. Use the left endpoint of each subinterval.
The area under the graph of f(x) = 0.04x^4 - 2.89x^2 + 86 over the interval [4,12] is approximately.
(Simplify your answer. Type an integer or a decimal.)