find the cube of 7 + 2b
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Answer:
343 + 8b³ + 294b + 84b²
Step-by-step explanation:
( 7 + 2b )³
( a + b )³ = a³ + b³ + 3ab ( a + b )
Here,
a = 7
b = 2b
( 7 + 2b )³
= 7³ + ( 2b )³ + 3 ( 7 ) ( 2b ) ( 7 + 2b )
= 343 + 8b³ + 42b ( 7 + 2b )
= 343 + 8b³ + 294b + 84b²
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