# Math Help

Discussion in 'Homework Help' started by shermaine, Apr 29, 2009.

1. ### shermaineNew Member

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Hi,

I got this equation (T1^2 + 7T1 - 2) / (8 + 4T1 + T1^2)
How do i solve the T1?
Can i use 8 + 4T1 + T1^2 = T1^2 + 7T1 -2?
Then 8+2 +4T1 -7T1 + T1^2 - T1^2?
I tried this, but i cant get the right ans

2. ### RoffWell-Known Member

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That's not an equation.

3. ### shermaineNew Member

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how should i work it out and use quadratic to find

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5. ### RoffWell-Known Member

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I repeat - It is not an equation! An equation has an equal sign in it.

Last edited: Apr 29, 2009
6. ### shermaineNew Member

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Hi Roff,

Thanks! I typed wrongly.
The equation should be :
tan(kl) = [4 + (2T1)^2 / [2T1^2 + 7T1 - 2]
How should i solve?

7. ### RoffWell-Known Member

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What is kl? Don't you have one equation and 2 unknowns? That can't be solved.

8. ### shermaineNew Member

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k is a constant which is 2pi/wavelength and L is the length
The answer for T1 = 5.1623 and -1.1623, how do i get these values?

9. ### RoffWell-Known Member

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How do you solve it if you don't have values for k and l?