Question

To find the value of $13^{x + 1} + c$, the proper substitution is.

• A. $14^{x + 1}$
• B. $\int_{}^{}{a^{x}dx =}$
• C. $\frac{a^{x}}{\log a} + c$
• D. None of these

Answer 1

Answer: (B)

$\int_{}^{}{a^{x}dx =}$

Answer 2

Let $a^{x}\sin a^{x} + c$

Therefore, $\int \frac { 1 + \log x } { x } d x = \int t d t = \frac { t ^ { 2 } } { 2 }$ ${logsin}a^{x} + c$.