Find the value of the following expression when $n = 2$
i) $5 n - 2$
ii) $5 n^{2} + 5 n - 2$

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Solution

i) 5 (2) - 2 = 10 - 2 = 8
ii) $5 (2)^{2} + 5 (2) - 2 = 5 (4) + 10 - 2 = 20 + 8 = 28$

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