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please help this summation questions with clear steps, thank you 5. Given the sum is i 3i+12 i=4 i2 +8i +14 (a) By changing suitable

please help this summation questions with clear steps, thank you
5. Given the sum is i 3i+12 i=4 i2 +8i +14 (a) By changing suitable index from 1' to j, show that this sum can be re-written as M j" - 2 m (b) Hence determine the value of sum 3i+12 ] i=4 i1+3i+14 by using the formula in C\"). Give your working steps. (2 marks) (4 marks)

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