1.

Expand (5x – 3y + 2)^2using identity.​

Answer»

IDENTITY used ↓

(a + b + C)² = + + + 2ab + 2bc + 2ca

(5x + (-3y) + 2)²

(5x)² + (-3y)² + (2)² + 2*5x*(-3y) + 2*(-3y)*2 + 2*5x*2

25x² + 9y² + 4 - 30xy - 12y + 20x



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