write the following cubes in expanded form
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use formula here
Step-by-step explanation:
( a + b ) ^3
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Answer:
i)8x²+12x²+6x+1
ii)x³-2x²y+4/3xy²-8/27y³
Step-by-step explanation:
i)(2x+1)³=(2x)³ + 3 (2x)²(1)+3(2x)(1²) +1³
=8x³+3 (2x)²(1)+3(2x)(1²)+1³
=8x²+12x²+6x+1
ii)(x - 3x)²=x³-3x²(2/3y)+3x(2/3y)²-(2/3y)³
=x³-2x²y+3x(2/3y)²-(2/3y)³
=x³-2x²y+4/3xy²-8/27y³
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