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Question
Find the product of 5x − 6y − 7z and 2x + 3y z
Sum
Solution
(5x − 6y − 7z) × (2x + 3y + z)
= 2x × (5x − 6y − 7z) + 3y × (5x − 6y − 7z) + z (5x − 6y − 7z)
= 10x2 − 12xy − 14xz + 15xy − 18y2 − 21yz + 5xz − 6yz − 7z2
= 10x2 − 12xy + 15xy − 14xz + 5xz − 18y2 − 21yz − 6yz − 7z2
= 10x2 + 3xy − 9xz − 18y2 − 21yz − 7z2
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Concept for Unknowns Through Examples with Simple Contexts (Single Operations)
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