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Question
Find the product of 5x − 6y − 7z and 2x + 3y
Sum
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Solution
(5x − 6y − 7z) × (2x + 3y)
= 2x × (5x − 6y − 7z) + 3y × (5x − 6y − 7z)
= 10x2 − 12xy − 14xz + 15xy − 18y2 − 21yz
= 10x2 + 3xy − 14xz − 18y2 − 21yz
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