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A9

B8

C6

D7

Answer:

B. 8

Read Explanation:

3x2+3x=72903^{x-2}+3^x=7290

3x32+3x=7290\frac{3^x}{3^2}+3^x=7290

3x(19+1)=72903^x(\frac19+1)=7290

3x(109)=72903^x(\frac{10}{9})=7290

3x=7290×9103^x=\frac{7290\times 9}{10}

3x=729×93^x=729 \times 9

3x=36×323^x=3^6\times 3^2

3x=383^x=3^8

x=8x=8


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