7. \( h(x)=\int x e^{x^{2}+4} d x \)
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To solve the integral \( h(x) = \int x e^{x^{2}+4} \, dx \), we can use substitution. Let’s set \( u = x^{2} + 4 \). Then, \( du = 2x \, dx \) or \( dx = \frac{du}{2x} \). This means \( x \, dx = \frac{du}{2} \). Now, substitute into the integral: \[ h(x) = \int e^{u} \frac{du}{2} = \frac{1}{2} \int e^{u} \, du = \frac{1}{2} e^{u} + C = \frac{1}{2} e^{x^2 + 4} + C \] where \( C \) is the constant of integration. So, \[ h(x) = \frac{1}{2} e^{x^2 + 4} + C. \] Now you've got the indefinite integral neatly solved!