Question

Can anyone please explain me the first two lines of the solution of the sum given in the attachment?

Answer 1

Step-by-step explanation:

By using the 1st property of summation series... i. e.,

1+1+1+1+..... Upto n terms is (n)

Applying the above property

1+1+1+1+........upto a terms is( a), - - - -(i)

Similarly...

i+i+i+....... upto b terms is ( ib) - - - - - - -(ii)

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Answer 2

HIII.....

THERE IS YOUR ANSWER......

THIS IS VERY SIMPLE STEP AS WE SEE IN THE QUESTION THE REQUIREMENT WAS a^2-b^2 SO BY COMONSENSE WE CAN MULTIPLY THE LHS AND RHS WITH CONJUGATES TO GET REQUIRED NO.

HOPE ITS HELP U......

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