Expand (5x - 3y - 2)2
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Given,
⇒ (5x - 3y - 2)2
Expanding,
⇒ (5x - 3y - 2)(5x - 3y - 2)
⇒ 25x2 - 15xy - 10x - 15xy + 9y2 + 6y - 10x + 6y + 4
⇒ 25x2 + 9y2 - 30xy - 20x + 12y + 4.
Hence, (5x - 3y - 2)2 = 25x2 + 9y2 - 30xy - 20x + 12y + 4.
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Expand (x - 2y + 2)2
Expand (5a - 3b + c)2
If a + b + c = 12 and a2 + b2 + c2 = 50; find ab + bc + ca.