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Question

Question 4(ii)
Simplify:
(2x+5)2(2x5)2


Solution

(2x+5)2(2x5)2
=(2x)2+2×2x×5+(5)2[(2x)22×2x×5+(5)2]
[Using identities (a+b)2=a2+2ab+b2 and (ab)2=a22ab+b2] =4x2+20x+25[4x220x+25]
=40x


Mathematics
NCERT Textbook
Standard VIII

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