Ifx²+y²=25, xy= 12, then x =
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Answer:
4
Step-by-step explanation:
x2+y2=25,xy=12
Substitute y=x12, we get
⇒x2+[x12]2=25⇒x4+144−25x2=0
⇒(x2−16)(x2−9)⇒x2=16 and x2=9
⇒x=±4 and x=±3
∴ Total number of values of x is 4.
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