a+b/a-b=4/5 then a/b=?
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Answer:
5
Step-by-step explanation:
We have,
la+bI²+la-bI² = (a+b) (a + b) +
(a - b) (a - b)
=a²+2ab+b²+a2-2ab+b²
= 2lal² + 21b/²
Therefore,
la + b² + la -bl²
5²+(a - b)² = 2 (3²+4²)
25+ (a - b)² = 50
→ la- bl² = 25
-la-bl=5
Hence,
Option 5 is the correct answer.
Hope it's helpful.
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