Simplify:
$(4 x + 2 y)^{2}$

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Solution

$(4 x + 2 y)^{2} = (4 x)^{2} + 2 (4 x) (2 y) + (2 y)^{2}$

Using $(a + b)^{2} = a^{2} + 2 a b + b^{2}$

$∴ (4 x + 2 y)^{2} = 16 x^{2} + 16 x y + 4 y^{2}$ .

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{(x - 2 y)}^{2} - 4 x + 8 y

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Question 84 (ii)

Simplify

$(3 x + 2 y)^{2} - (3 x - 2 y)^{2}$

Question 84 (i)

Simplify

$(3 x + 2 y)^{2} + (3 x - 2 y)^{2}$

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