Indefinite intergral help 2 questions please

S

Safejack

New member
Joined
Nov 1, 2014
Messages
2
Hi

I have attempted these two questions:

1. ∫ 9x^4e^x^5 dx

The answer i get :

= 9/5x^5.e^x^5 + c

The Correct Answer :

= (9/5)e^x^5 + c

.......................................................................
The Second Question :

2. ∫ (4x^7 + 12x^5)/(x^8 + 4x^6) dx

The answer i get :

= 1/2x^8 + 2x^6 - 1/9 x^9 - 4/7 x^7 + c

The Correct Answer :

= 1/2 ln |x^8 + 4x^6| + c

Thank you in advance for the help
 
Safejack said:
Hi

I have attempted these two questions:

1. ∫ 9x^4e^x^5 dx

The answer i get :

= 9/5x^5.e^x^5 + c

The Correct Answer :

= (9/5)e^x^5 + c..............Differentiate this function - what do you get

Now differentiate (9/5x^5.e^x^5 + c) - your answer - what do you get?
.......................................................................
The Second Question :

2. ∫ (4x^7 + 12x^5)/(x^8 + 4x^6) dx

The answer i get :

= 1/2x^8 + 2x^6 - 1/9 x^9 - 4/7 x^7 + c

The Correct Answer :

= 1/2 ln |x^8 + 4x^6| + c

Again differentiate "correct answer" and your answer - what do you get?

Thank you in advance for the help
Click to expand...
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Managed 2 find my problem , and managed 2 get the correct answer thanks though
 
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