(x+2y)^3 +(x- 2y)^3 factorize
Answers
Answered by
1
Answer:
2x^3+24xy^2
Step-by-step explanation:
(x+2y)^3+(x-2y)^3
By using (x+y)^3=x^3+y^3+3x^2y+3xy^2
(x+2y)^3+(x-2y)^3
=x^3+8y^3+6x^2y+12xy^2+x^3-8y^3-
6x^2y+12xy^2
2x^3+24xy^2
Answered by
0
Answer:
Step-by-step explanation:
let (x+2y)=a and (x-2y)=b
so
a³+b³=(a-b)(a²+ab+b²)
now
(x+2y)³+(x-2y)³=[(x+2y)-(x-2y)][(x+2y)²+(x+2y)(x-2y)+(x-2y)²]
=[x+2y-x+2y][(x²+4y²+4xy)+(x²-4y²)+(x²+4y²-4xy)]
=4y[x²+4y²+4xy+x²-4y²+x²+4y²-4xy]
=4y[x²+x²+x²+4y²-4y²+4y²+4xy-4xy]
=4y[3x²+4y²]
=12xy²+16y³
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