if X + Y is equal to 4 find x cube + y cube + 12 x y - 6 y
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Hi ,
x + y = 4 ---( 1 )
x³ + y³ + 12xy - 6y
= ( x + y )³ - 3xy( x + y ) + 12xy - 6y
= 4³ - 3xy × 4 + 12xy - 6y
= 64 - 12xy + 12xy - 6y
= 64 - 6y
I hope this helps you.
: )
x + y = 4 ---( 1 )
x³ + y³ + 12xy - 6y
= ( x + y )³ - 3xy( x + y ) + 12xy - 6y
= 4³ - 3xy × 4 + 12xy - 6y
= 64 - 12xy + 12xy - 6y
= 64 - 6y
I hope this helps you.
: )
Answered by
0
Hi,
Please see the attached file!
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Please see the attached file!
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