Question
If x2+y2=25,xy=12,then complete set of x =
Answer: Option C
:
C
x2+y2=25 and xy=12
⇒x2+(12x)2=25 ⇒x4+144−25x2=0
⇒(x2−16)(x2−9)=0 ⇒x2=16 and x2=9
⇒x= ±4 and x = ±3
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:
C
x2+y2=25 and xy=12
⇒x2+(12x)2=25 ⇒x4+144−25x2=0
⇒(x2−16)(x2−9)=0 ⇒x2=16 and x2=9
⇒x= ±4 and x = ±3
Was this answer helpful ?
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