Let us solve problem on calculus 101 
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Solved Integral Calculus 101 problems
Evaluate the integral of the mentioned equation 6x2+18x dx.
Solution:
            ∫6x2+18x dx = ∫6x2 dx +∫18x dx
            Integrate the above equation
            We get,  
-->6x³/3 + 18x²/2 
             2x3+ 9x2. = 2x3+ 9x2
Integrating the following expression 2ex + 13ex .
Solution:
            The given expression is 2ex + 13ex  
                = ∫ 2ex+ 13 ex dx
            = ∫ 2 ex dx + ∫ 13 ex dx
           = 2ex+ 13 ex + c. = 2ex+ 13 ex + c