Attempt the question, check the explanation, and continue with similar questions to build confidence before exams.
x^3 e^x - 3∫x^2 e^x dx + C
e^x x^3 - 3e^x + C
e^x(x^3 - 3x^2) + C
e^x(x^3 - 1) + C
Continue with nearby questions to strengthen the same chapter concept while you still have the context fresh in mind.