Asked by Lauren
By making the substitution u=7^x and using part a, derive a hidden quadratic equation
7^(2x-1) +4×7^(x-1) -1/14 =0
and hence find all of the solutions to the above equation.
7^(2x-1) +4×7^(x-1) -1/14 =0
and hence find all of the solutions to the above equation.
Answers
Answered by
Steve
so, did you do the substitution?
7^(2x) = u^2
the rest is just numbers, so you have a quadratic equation with a bunch of 7's floating around.
7^(2x) = u^2
the rest is just numbers, so you have a quadratic equation with a bunch of 7's floating around.
Answered by
urgent help needed
I don't understand how you would do that
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