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Question
Expand : (3x – 4y + 5z)2
Sum
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Solution
(3x – 4y + 5z)2
= (3x)2 + (– 4y)2 + (5z)2 + 2(3x) (– 4y) + 2(– 4y) (5z) + 2(5z) (3x)
= 9x2 + 16y2 + 25z2 – 24xy – 40yz + 30zx
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Important Formula of Expansion
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