Question

X2+y2=25 and xy=8, find x+y​

Answer 1

Answer:

5

is the answer

Step-by-step explanation:

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Answer 2

Answer:

x2+y2 =25,xy=12

Substitute y= 12/x

, we get

⇒x^2+[ 12/x ]^ 2=25⇒x ^4+144−25x ^2=0

⇒(x^2 −16)(x ^2 −9)⇒x ^2=16 and x ^2=9

⇒x=±4 and x=±3

∴ Total number of values of x is 4.