Practice Problems: Solve the following integration problems. Provide step-by-step solutions.
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- Integrate f(x)=3×2+2x+1f(x) = 3x^2 + 2x + 1f(x)=3×2+2x+1.
- Use substitution to integrate g(x)=x⋅x2+4g(x) = x \cdot \sqrt{x^2 + 4}g(x)=x⋅x2+4.
- Use integration by parts to integrate h(x)=x⋅ln(x)h(x) = x \cdot \ln(x)h(x)=x⋅ln(x).
Complete the above, save them into one .pdf, and upload them when complete.