idk122113 idk122113
  • 25-10-2017
  • Mathematics
contestada

log(-2a+9)=log(7-4a)

please helpp!!

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austinbrown164 austinbrown164
  • 25-10-2017
Verify each of the solutions by substituting them back into the original equation log(−2a+9)=log(7−4a)log(-2a+9)=log(7-4a) and solving. In this case, all solutions were found to be valid.a=−1
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Catya
Catya Catya
  • 25-10-2017
assuming it's the same base log on either side you can just set the inside equal.

-2a + 9 = 7 - 4a
-2a + 4a = 7 - 9
2a = -2
a = -1
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