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Find the greatest value of c such that ...

Find the greatest value of c such that system of equation `x^(2) + y^(2)=25, x+y =c` has a real solution

A

5

B

`5sqrt(2)`

C

`2sqrt(2)`

D

`sqrt(2)`

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The correct Answer is:
B
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MOTION-TRIGNOMETRIC RATIOS & IDENTITIES -Exercise 1
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