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If b = 5, determine the value of an expression using an identity.
Question

If b = 5, determine the value of an expression using an identity.

A.

25726

B.

15626

C.

15438

D.

25636

Correct option is B

Given: 
b = 5 
To find:  (5b+5b)(25b2+25b225)\left(\frac{5}{b}+5b \right) \left( \frac{25}{b^2}+25b^2-25 \right)   
Formula Used:  
a3+b3=(a+b)(a2+b2ab)a^3 + b^3 = (a+b)(a^2+b^2-ab)​​
Solution:

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