Factorise by using the identity: a² -b² = (a +b)(a−b)
(i) a² -1
(ii) 9k² -25
(iii) 64x² - 81y²

Using the identity (x + a)(x + b) =  x² + x(a + b) + ab , find the following product.
(x + 3)(x + 7)

Using the identity (x + a)(x + b) = x² + x(a + b) + ab ,find the following product.
(4x + 3y) ( 4x + 5y)

Expand the following squares, using suitable identities.
(2x + 5)²

Expand the following squares, using suitable identities.
(mn + 3p)²