6. + 5/8 points Previous Answers Find 7 (x) for the given function at the number a. f(x) = x72 a=1 n=3 0.8 sxs 1.2 T3(x) = 1-2(x - 1) +3(x -1)2 -4(x - 1)3 Investigate the accuracy of your approximation by finding an upper bound for |R (x) | when x lies in the given interval. (Round your answer to four decimal places.) R3(x)| = 1.6745 X