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OpenStudy (anonymous):
solve 2(5^2x) - 7(5^x) = 15 for x. HELP!
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OpenStudy (anonymous):
let 5^x=a then the equation will be 2a^2-7a=15 let all numbers in one side. 2a^2-7a-15=0. find a. then put 5^x=a find x.
OpenStudy (anonymous):
thank you!
OpenStudy (anonymous):
your welcome :) i wish it would be helpful.
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