Question

Use suitable identity to find (2a -7) (2a-7)
class 8th Maths​

Answer 1

Answer:

4a^2-28a+49

Step-by-step explanation:

(2a-7)(2a-7)

=(2a-7)^2

As we know,

(a-b)^2=a^2-2ab+b^2

(2a-7)^2

=(2a)^2-(2)(2a)(7)+7^2

=4a^2-28a+49