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put your TI-89 or 92 to work

L

lesch2k

Golden Member
could you please solve this equation for x

tan [90degrees - arctan( 8/(x-4) ) ] = (x-8) / (x-4)

thanks, i dont have access to a calculator right now and need to settle a math bet.
 
Originally posted by: WannaFly
if your sitting at a computer, usually you would have access to a calculator...no?
Click to expand...

Not many of the calculators that come with computers can do trigonometric equations 😉
 
Originally posted by: Muzzan
Anyway, I'm getting x = 8 +/- 4i with derive.
Click to expand...

Oh yeah, that's right. I thought he wanted to just simplify the left part of the equation, and the right was what he got.

/should start reading entire posts
 
Originally posted by: lesch2k
could you please solve this equation for x

tan [90degrees - arctan( 8/(x-4) ) ] = (x-8) / (x-4)

thanks, i dont have access to a calculator right now and need to settle a math bet.
Click to expand...

I get 8 +/- 8*i

tan(pi/2 - arctan(x)) = 1/x

using this you get:
(x-4)/8 = (x-8)/(x-4)
(x-4)^2 = 8x-64
x^2-8x+16 = 8x-64
x^2-16x+80 = 0

quadratic eq. gives 8 +- 8i

Edit: quadratic eq. gives 8 +- 4i
Yes I can do math 😛
 
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