Math
posted by andre .
Solve the equation using exact values. Check for any extraneous roots. 9^2x+4(9^x)=21.

(9^x)^2 + 4(9^x)  21 = 0
(9^x + 7)(9^x  3) = 0
...
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Could someone please help me to solve this equation using exact values. 9^(2x)+4(9^x)=21 and also check for extraneous roots. thank you