Question

Expand the following (a) (3x +1/y)^2 (b)(x^2-2y)^2​ ​

Answer 1

Answer:

On using binomial expansion, we get

(3x+2y)

4

=(3x)

4

+

4

C

1

(3x)

3

(2y)+

4

C

2

(3x)

2

(2y)

2

+

4

C

3

(3x)(2y)

3

+

4

C

4

(2y)

4

On solving we get

(3x+2y)

4

=81x

4

+216x

3

y+216x

2

y

2

+96xy

3

+16y

4