A.
(x+2y)³
=(x+2y)(x+2y)(x+2)
=(x²+2yx+2yx+4y²)(x+2y)
=(x²+4yx+4y²)(x+2y)
=(x³+4yx²+4y²x+2yx²+8y²x+8y³)
=x³+6yx²+12y²x+8y³
=x³+6x²y+12xy²+8y³
B.
(2a-b)⁴
=((2a-b)(2a-b))((2a-b)(2a-b))
=(4a²-4ab+b²)(4a²-4ab+b²)
=(16a⁴-16a³b+4a²b²-16a³b+16a²b²-4ab³+4a²b²-4ab³+b⁴)
=16a⁴-32a³b+24a²b²-8ab³+b⁴
maaf kalau ada yang salah
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A.
(x+2y)³
=(x+2y)(x+2y)(x+2)
=(x²+2yx+2yx+4y²)(x+2y)
=(x²+4yx+4y²)(x+2y)
=(x³+4yx²+4y²x+2yx²+8y²x+8y³)
=x³+6yx²+12y²x+8y³
=x³+6x²y+12xy²+8y³
B.
(2a-b)⁴
=((2a-b)(2a-b))((2a-b)(2a-b))
=(4a²-4ab+b²)(4a²-4ab+b²)
=(16a⁴-16a³b+4a²b²-16a³b+16a²b²-4ab³+4a²b²-4ab³+b⁴)
=16a⁴-32a³b+24a²b²-8ab³+b⁴
maaf kalau ada yang salah