*Inverse of sub. 1 is add. 1
*Inverse of mult. by .5 is divide by .5
*Use the calculator to find ln 20
*lne is 1
*Inverse of mult. by 4 is to divide by 4
*Exponential expression isolated
*Use the calculator to find ln 25.5 and ln
10
Note how we have a trinomial and that e to the 2x is e to the x squared. This means it is quadratic
in from. So we can factor it just like a trinomial of the form .
*Set the 1st factor = 0
*Isolate the exponential expression
*Set the 2nd factor = 0
*Isolate the exponential expression
So there is only one equation that we can solve .
*Use the calculator to find ln 7
*lne = 1
Last revised on March 23, 2011 by Kim Seward.
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