4. Given the data below: x 1.0 1.2 1.4 1.6 1.8 2.0 f(x) 2.2183 2.6001 3.0752 3.6730 4.4296 5.3891 i. State the number of possible solutions could be obtained to approximate f'(2.0) by using 3-point backward formula. ii. Calculate all possible answer(s) you state in (i). iii. Given the actual value for f'(2.0) is 5.3891. Compare the result obtained in (ii) and explain the error of the estimation in term of h.

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