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Sum
Expand.
(3x+4y) (3x+5y)
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Solution
(3x+4y) (3x+5y)
= (3x)2 + {4y + 5y} (3x) + (4y) × (5y)
= 9x2 + 9y × 3x + 20y2
= 9x2 + 27xy + 20y2
Concept: Expansion of (x + a)(x + b)
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