Question 1 (ii)
Find the squares of the following numbers:

35

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Solution

$35^{2} = (30 + 5)^{2} ⌊ ∵ (a + b)^{2} = a^{2} + 2 a b + b^{2} ⌋ = 900 + 300 + 25 = 1225$

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