Question

iii) Expand: (2a-10b)(2a+10b)
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Answer 1

Answer:

use identity (a+b)(a-b)=(a-b)^2

(2a-10b)^2

2a^2-10b^2

4a^2-100b^2

hope this helps!

Answer 2

we can identity of a^2 - b^2 = (a+b) (a-b)

a = 2a. b= 10b

a^2-b^2

2a^2 - 10b^2.

4a^2 - 100b^2