Expand (x - 2y + 2)2
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Given,
⇒ (x - 2y + 2)2
Expanding,
⇒ (x - 2y + 2)(x - 2y + 2)
⇒ x2 - 2xy + 2x - 2xy + 4y2 - 4y + 2x - 4y + 4
⇒ x2 + 4y2 + 4 - 4xy - 8y + 4x.
Hence, (x - 2y + 2)2 = x2 + 4y2 + 4 - 4xy - 8y + 4x.
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