Simplify. (2x+5)2−(2x−5)2?
Using formula
(2x+5)2−(2x−5)2=2x2+2(2x)(5)+52–2x2+2(2x)(5)-52
=0+40x+0=40x
∴(2x+5)2−(2x−5)2=40x
Question 4(ii) Simplify: (2x+5)2−(2x−5)2
Evaluate (2x+5)2−(2x−5)2