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You can just simply multiply it in 3 times. but there's a pattern for it 
(a+b)*3= a*3+3(a*2)b+3a(b*2)+b*3
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Example (x+y)³
then u multiply the x in cube =x³ then,first the x² the multiply the 3xX²xy =3x(squared)y then the third is multiply the 3xXxy²=3xy² the last is multiply the y in cube is =y³
te answer is=x³+3x²y+3xy²+y³
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