Question

10. (i) x4 – y4 + x2 - y2​

Answer 1

Step-by-step explanation:

Let us solve x

4

+y

4

+x

2

y

2

=(x

4

+y

4

+2x

2

y

2

)−x

2

y

2

=(x

2

+y

2

)

2

−(xy)

2

Using a

2

−b

2

=(a+b)(a−b)

x

4

+y

4

+x

2

y

2

=(x

2

+y

2

+xy)(x

2

+y

2

−xy)

Hence, option C is correct