a-b=5 ab=2 a^4+b^4=?

Question

a-b=5 ab=2 a^4+b^4=?

0

895

3

+41

$a-b=5$

$ab=2$

$a^2+b^2=?$

$a^4+b^4=?$

danielr_ddrp Jul 25, 2016

3⁺¹ Answers

3 Online Users

Melody · Answer 1 · 2016-07-25T01:16:03

Hi Daniel, :)

$a-b=5\\ (a-b)^2=25\\ a^2-2ab+b^2=25\qquad but\;\;ab=2\\ a^2 -2*2+b^2=25\\ a^2 -4+b^2=25\\ a^2 +b^2=29\\~\\ (a^2 +b^2)^2=29^2\\ a^4+2*a^2b^2 +b^4=841\\ a^4+b^4+2ab*ab =841\\ a^4+b^4+2*2*2 =841\\ a^4+b^4+8 =841\\ a^4+b^4=833\\$

Melody · Answer 2 · 2016-07-25T02:08:16

#2

+118703

0

Do you understand it all Daniel?

Melody Jul 25, 2016

#3

+41

+5

Yes, thanks

danielr_ddrp Jul 25, 2016

a-b=5 ab=2 a^4+b^4=?

0 users composing answers..

3⁺¹ Answers

3 Online Users

Top Users

Sticky Topics

a-b=5 ab=2 a^4+b^4=?

0 users composing answers..

3+1 Answers

3 Online Users

Top Users

Sticky Topics

3⁺¹ Answers