Find the volume of a cube whose edge is 9x - 8y
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Hello!
Cube’s side = 9x - 8y
Then,
✓ Volume :
( side )³
⇒ ( 9x - 8y )³
⇒ ( 9x )³ - ( 8y )³ - 3 ( 9x ) ( 8y ) ( 9x - 8y )
⇒ 729x³ - 512y³ - 216xy ( 9x - 8y )
⇒ 729x³ - 512y³ - ( 1944x²y - 1728xy² )
⇒ 729x³ - 512y³ - 1944x²y + 1728xy²
Cheers!
Cube’s side = 9x - 8y
Then,
✓ Volume :
( side )³
⇒ ( 9x - 8y )³
⇒ ( 9x )³ - ( 8y )³ - 3 ( 9x ) ( 8y ) ( 9x - 8y )
⇒ 729x³ - 512y³ - 216xy ( 9x - 8y )
⇒ 729x³ - 512y³ - ( 1944x²y - 1728xy² )
⇒ 729x³ - 512y³ - 1944x²y + 1728xy²
Cheers!
cdprk:
Thank youu
You're welcome!
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