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Question
Factorise:
8x3 + 343y3
Sum
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Solution
Given expression: 8x3 + 343y3
⇒ (2x)3 + (7y)3
We know that,
a3 + b3 = (a + b) (a2 – ab + b2)
Hence,
⇒ (2x + 7y) (4x2 – 14xy + 49y2)
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