F(x) = x1/7, a = 1, n = 3, 0.7 ≤ x ≤ 1.3 (a) approximate f by a taylor polynomial with degree n at the number a. t3(x) = 1+ (x−1) 7− 6(x−1)2 98+ 78(x−1)3 2058 (b) use taylor's inequality to estimate the accuracy of the approximation f(x) ≈ tn(x) when x lies in the given interval. (round your answer to eight decimal places.)|r3(x)| ≤