Q : 1     Use a suitable identity to get each of the following products in bracket.            (iii) $(2a-7)(2a-7)$

(2a -7) X (2a - 7)  = $(2a - 7)^{2}$
$(a-b)^{2} = a^{2} - 2ab + b^{2}$
$(2a-7)^{2} = (2a)^{2} - 2(2a)(7) + 7^{2}$
=  $4a^{2} - 28a + 49$