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Hello could someone help me with these questions

 

Find the indefinite integral of the following with respect to x:

 

Find the definite integral:

 Mar 7, 2015

Best Answer 

 #1
avatar+130516 
+5

For the first one, we have

∫Be^6x dx      let u = 6x    du =6 dx     du/6 = dx     so we have

(B/6)∫e^u du  =

(B/6) [ e^u] + C   =    (Be^6x) / 6   + C

 

For the second we have

∫6x^2  + 5x - 10 dx =

2x^3 + (5/2)x^2 - 10x  from x = 1 to x = 3

[2(3)^3 + (5/2) (3)^2 - 10 (3) ]  - [2(1)^3 + (5/2)(1)^2 - 10(1)] =

[54 + 45/2 - 30 ] - [2 + 5/2 - 10] =

52 

 

  

 Mar 8, 2015
 #1
avatar+130516 
+5
Best Answer

For the first one, we have

∫Be^6x dx      let u = 6x    du =6 dx     du/6 = dx     so we have

(B/6)∫e^u du  =

(B/6) [ e^u] + C   =    (Be^6x) / 6   + C

 

For the second we have

∫6x^2  + 5x - 10 dx =

2x^3 + (5/2)x^2 - 10x  from x = 1 to x = 3

[2(3)^3 + (5/2) (3)^2 - 10 (3) ]  - [2(1)^3 + (5/2)(1)^2 - 10(1)] =

[54 + 45/2 - 30 ] - [2 + 5/2 - 10] =

52 

 

  

CPhill Mar 8, 2015
 #2
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Thank You!!

 Mar 8, 2015

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