Tuesday

October 21, 2014

October 21, 2014

Posted by **Lucy** on Sunday, October 12, 2008 at 10:05pm.

Answer: (+/-3, +/-1) or (+/-1, +/-3)

- Pre-Calculus-check answer -
**drwls**, Sunday, October 12, 2008 at 11:53pmYes, all of those answers work. You can prove that by substitution.

You can also derive it by substituting 3/x for y in the first equation.

x^2 + 9/x^2 = 10

x^4 - 10x^2 +9 = 0

(x^2-9)(x^2 - 1) = 0

(x+3)(x-3)(x+1)(x-1) = 0

**Answer this Question**

**Related Questions**

Pre-Calculus - Could someone check my answers? 25. 32^(2x-3)=2 Answer- x= 8/5 26...

Pre-calculus-check answers - Write the slope-intercept form of the equation of ...

Pre-calculus-check answers - If f(x)=4x^2 and g(x)=2/x, find [g x f](x). Answer...

Pre-Calculus-check answers - How many ways can 5 students be chosen from a group...

Pre-calculus-check answer please - Write the standard form of the equation of ...

calculus - Could somebody please check these for me? Solve the differential ...

calculus - Could somebody please check these for me? Solve the differential ...

Pre-Calculus-check answers - Name all the values of x that are not in the domain...

Pre-calculus-check answers - Name all the values of x that are not in the domain...

Pre-calculus-check answer - If cot theta =0.85, find tan theta. Answer: 1.176