Asked by pat
If a, b are the solutions of the equation log base 3 (5-2x)+ log base 3 (5+2x)=2
find the value of the product ab.
find the value of the product ab.
Answers
Answered by
drwls
3^2 = (5 + 2x)(5 - 2x) = 25 - 4x^2
4x^2 = 16
x^2 = 4
x = 2 or -2 are the two solutions.
The product of those two solutions is -4.
This is not a trig question. It is about logartithms and algebra.
4x^2 = 16
x^2 = 4
x = 2 or -2 are the two solutions.
The product of those two solutions is -4.
This is not a trig question. It is about logartithms and algebra.
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