Q3-a (0 points) Consider the sum (3)2 + (8)2 + (13)2+ ... + ( 15n - 2)2: Write the sum in sigma notation. + Drag and drop an image or PDF file or click to browse... L. Q3-b (0 points) Consider the sum (3)2 + (8)2 + (13) 2 + ... + ( 15n - 2)2. m Use identities 5 [m(m + 1)] and k=1 m k2 = = [m(m + 1)(2m + 1)] to prove k=1 that (3)2 + (8)2 + (13)2+ ... + (15n - 2)2 = -(n) (450n2+ 69n- 35