a) (2x + y)2 – (2x – y)2 = 8xy
b) (2x – 3)2 – (2x + 3)2 = -24x || - 24x
a) (2x + y)2 – (2x – y)2 = 8xy
b) (2x – 3)2 – (2x + 3)2 = -24x || - 24x
a) (2x + y)2 – (2x – y)2
= [(2x + y) – (2x – y)] . [(2x + y) + (2x – y)]
= (2x + y – 2x + y)(2x + y + 2x – y)
= 2y . 4x
= 8xy
b) (2x – 3)2 – (2x + 3)2
= [(2x – 3) – (2x + 3)] . [(2x – 3) + (2x + 3)]
= (2x – 3 – 2x – 3)(2x – 3 + 2x + 3)
= (– 6) . 4x
= – 24x