4 + 5 b ka whole cube
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4² + 5b² + 2×4×5b........ .
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(4+5b)³ = 4³ +(5b)³ +3×4×5b(4+5b)
= 64+125b³+ 60b (4+5b)
=64 + 125b³ + 240b + 300b²
= 64+125b³+ 60b (4+5b)
=64 + 125b³ + 240b + 300b²
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