(1) Find the value of (x+y)³.
PLZZZ ANS THESE QUESTION IT'S VERY IMPORTANT FOR ME.......
Answers
Answered by
1
Answer:
HI
Step-by-step explanation:
(X+Y)³
X3+Y3+2XY+2X²Y+2XY²+3XY
Answered by
35
Step-by-step explanation:
The formula is
(x+y)³=x³+y³+3xy(x+y)
Proof for this formula step by step:
=(x+y)³
=(x+y)(x+y)(x+y)
={(x+y)(x+y)}(x+y)
=(x²+xy+xy+y²)(x+y)
=(x+y)(x²+y²+2xy)
=x³+xy²+2x²y+yx²+y³+2xy²
=x³+y³+3x²y+3xy²
=x³+y³+3xy(x+y)
Hence proved...
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