Give the answer in exact form.
-$$4 \mathrm { e } ^ { 2 \mathrm { x } } + 9 \mathrm { e } ^ { \mathrm { x } } = 9$$
A) $\left\{ \mathrm { e } ^ { 3 / 4 } , \mathrm { e } ^ { - 3 } \right\}$
B) $\left\{ \ln \frac { 4 } { 3 } \right\}$
C) $\left\{ \ln \frac { 3 } { 4 } \right\}$
D) $\left\{ \ln \frac { 3 } { 4 } , \ln ( - 3 ) \right\}$

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The Answer of Give the answer in exact form.
-$$4 \mathrm { e } ^ { 2 \mathrm { x } } + 9 \mathrm { e } ^ { \mathrm { x } } = 9$$
A) $\left\{ \mathrm { e } ^ { 3 / 4 } , \mathrm { e } ^ { - 3 } \right\}$
B) $\left\{ \ln \frac { 4 } { 3 } \right\}$
C) $\left\{ \ln \frac { 3 } { 4 } \right\}$
D) $\left\{ \ln \frac { 3 } { 4 } , \ln ( - 3 ) \right\}$

Give the Answer in Exact Form 4e2x+9ex=94 \mathrm { e } ^ { 2 \mathrm { x } } + 9 \mathrm { e } ^ { \mathrm { x } } = 94e2x+9ex=9

Give the Answer in Exact Form $4 \mathrm { e } ^ { 2 \mathrm { x } } + 9 \mathrm { e } ^ { \mathrm { x } } = 9$