How do you evaluate the definite integral $int 3 dx$ from [2,7]?

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Answer 1 · 2016-11-08T22:30:50

$int_3^7 3dx = 15$

We want to find $int_2^7 3dx$

Using the power rule for integrating $x^n$ we have:

$int_2^7 3dx = [3x^1/1]_2^7$
$:. int_2^7 3dx = [3x]_2^7$
$:. int_2^7 3dx = 3(7) - (3)(2)$
$:. int_2^7 3dx = 21- 6$
$:. int_2^7 3dx = 15$

How do you evaluate the definite integral int 3 dxint 3 dx from [2,7]?