expand (a) (2x+3y)³
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Answered by
2
We use the above identity: (a+b)
3
=a
3
+3a
2
b+3ab
2
+b
3
. Take a=2x and b=3y and we get
(2x+3y)
3
=(2x)
3
+3(2x)
2
(3y)+3(2x)(3y)
2
+(3y)
3
=8x
3
+36x
2
y+54xy
2
+27y
3
Answered by
3
We use the above identity: (a+b) 3
=a
3
+3a
2
b+3ab
2
+b
3
. Take a=2x and b=3y and we get
(2x+3y)
3
=(2x)
3
+3(2x)
2
(3y)+3(2x)(3y)
2
+(3y)
3
=8x
3
+36x
2
y+54xy
2
+27y
3
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