Q. Calculate the integral and write your answer in simplest form.∫45x3dxAnswer:
Simplify integrand: Simplify the integrand.The integral of a constant times a function is the constant times the integral of the function. So, we can take the constant 45 out of the integral.I=∫45x3dxI=(45)×∫x3dx
Rewrite square root: Rewrite the square root of x3 as x(3/2).I=45∫x3dxI=45∫x(3/2)dx
Apply power rule: Apply the power rule for integration.The power rule states that the integral of xn with respect to x is (x(n+1))/(n+1), provided n=−1.I=45∫x23dxI=45[(23+1)x(23+1)]+C
Simplify exponent and fraction: Simplify the exponent and the fraction.I=45⋅[25x25]+CI=45⋅[52⋅x25]+C
Simplify constants: Simplify the constants.I=(45)⋅(52)⋅x25+CI=(21)⋅x25+C
Write final answer: Write the final answer.The indefinite integral of 45x3 with respect to x is 21⋅x25+C.
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