Question

Topic = nth term

For the sequence u = 2n² - 5n+ 3, determine:

Find the value of n for which u = 45

Answer 1

Explanation:

Answer 2

6

Explanation:

u = 2n² - 5n + 3

u = 45

2n² - 5n + 3 = 45

2n² - 5n - 42 = 0

(2n - 7)(n + 6) = 0

2n - 7 = 0 or n - 6 = 0

n = 7/2 or n = 6

Answer: 6