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aditya

· started a discussion

· 1 Months ago

soln (Question: 257205.0 )

a - b +7 = 0

-b + 7 = -a add m to both side

( m-b) +7 = (m- a) => (m-a) - (m-b) = 7

(m-a) - 1/(m-a) = 7

now question is ready (m-a)^3 - 1 /(m-a)^3

7^3 + 3(7)

= 343+ 21 = 364

Question:

If (m – a)(m – b) = 1 and a – b + 7 = 0, find the value of  (m – a)3    –  (m – b)3   .

Options:
A)

343

B)

322

C)

364

D)

356

Solution:

Ans: (c)

  

isha mishra

· commented

· 1 Months ago

You are awesome ..........thanks

Knowledge Expert

· commented

· 1 Months ago

Dear Student,
Your approach is also nice.
You can do it in this way also.

Thanks and Regards
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