Question about Texas Instruments TI-89 Calculator

Im trying to solve this equations

I am trying to find the value of x from this equation f(x)= 1/75 *e^ -(x/75)

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X is a function, therefore it has infinite solutions. you need the function to equal a number to solve for a specific x value

ex: f(x)= 1/75*e^(-x/75)

20= 1/75*e^(-x/75), then under catolog choose solve.

solve((1/75)*e^(-x/75)=20,x) the x is what you are solving for at the end.

long hand would be multiply by 75 to get rid of 1/75..so now you have
1500=e^(-x/75)

now Ln gets rid of e so Ln(1500) = -x/75, so x = -75*ln(1500)

hope this all helps

Posted on Apr 27, 2010

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