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Question
Find the square of x − 2y +1
Sum
Solution
(x − 2y +1)2 = (x)2 + (−2y)2 + (1)2 + 2 × x × −2y + 2 × (−2y) ×1 + 2 × 1 × x
= x2 + 4y2 + 1 − 4xy − 4y + 2x
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