# Answer to Question #1991 in Calculus for Jess

Question #1991

Given.

int_0^1 15 x sqrt(x^2+9)dx = 50 sqrt(10)-135

Evaluate.

int_1^0 15 u sqrt(u^2+9)du

int_0^1 15 x sqrt(x^2+9)dx = 50 sqrt(10)-135

Evaluate.

int_1^0 15 u sqrt(u^2+9)du

Expert's answer

Since the dounds of integrating were reversed, the answer would be: -(50√(10)-135) = 135 - 50√30

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