Write the summation to estimate the area under the curve y = 2x2 + 1 from x = 0 to x = 4 using 4 rectangles and left endpoints. the summation from i equals 0 to 4 of the quantity 2 times i squared plus 1 the summation from i equals 1 to 3 of the quantity 2 times i squared plus 1 the summation from i equals 0 to 3 of the quantity 2 times i squared plus 1 the summation from i equals 1 to 4 of the quantity 2 times i squared plus 1