If a-b = 2, ab=15, find: a+b
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Given:
To find: the value of
Solution:
- Before solving the problem, we must know algebraic identity as follows,
- Now putting
and
in the above formula, we get
- Note: since the left hand side contains a perfect square
, it cannot be negative. So we take
as the required value.
Answer: the value of is
.
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