Question

$(a + b) {}^{2} \times x {}^{2} + 4abxy \: - (a - b) {}^{2} y {}^{2}$
​

Answer 1

Answer:

Now,

(a

2

−b

2

)(x

2

−y

2

)+4abxy

=a

2

x

2

+b

2

y

2

+2abxy−(a

2

y

2

−2abxy+b

2

x

2

)

=(ax+by)

2

−(ay−bx)

2

=(ax+by+ay−bx)(ax+by−ay+bx).