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Question

Find the square of :
$$ x - 2y + 1 $$


Solution

$${\left(x-2y+1\right)}^{2}=(x)
^2+(-2y)^2+(1)^2+2 \times x$$
$$(x-2y+2 \times (-2y) \times 1+2 \times 1 \times x)$$
$$=x^2+4y^2+1-4xy-4y+2x$$

Maths

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