How do you evaluate the definite integral $int x^2 dx$ from $[1,2]$ ?

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Answer 1 · 2016-11-04T07:13:04

$int_1^2x^2dx=7/3$

As $d/(dx)x^3=3x^2$

$int_1^2x^2dx=|x^3/3|_1^2$

= $(2^3/3-1^3/3)$

= $8/3-1/3=7/3$

How do you evaluate the definite integral int x^2 dxint x^2 dx from [1,2][1,2]?