Question

Show that :
( 7pqr-5)² - (7pqr+5)²/(pqr+1)² - (pqr-1)² = -35

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Answer 1

Answer:

hence prove

Step-by-step explanation:

please see in photo

Answer 2

Answer:

{(7pqr-5)² – (7pqr+5)²} / {(pqr+1)²– (pqr-1)²} = –35

L.H.S.

= –(4×7pqr×5) / (4×pqr×1)

= –35 (Proved)

Step-by-step explanation:

at the 1st step we can see that, (a-b)² – (a+b)² = –4ab

and we also know that, (a+b)² – (a-b)² = 4ab

so here, a = 7pqr and b = 5

and at the 2nd step we cut pqr and 4 and the result is –35