Question

(a+b)=9 ab=20then a2+b2=?​

Answer 1

Hi ,

It's given that ,

a + b = 9 ,

ab = 20 

a² + b² = ( a + b )² - 2ab 

= 9² - 2 × 20

= 81 - 40

= 41

I hope this helps you .

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Answer 2

(a+b)=9. a=9-b

ab=20

=>(9-b)b=20

=>9b-b^2=20

=>b^2-9b+20

=>b^2-5b-4b+20

=>b(b-5)-4(b-5)

=>(b-4)(b-5)

b=4,5

b=4,a=5

b=5,a=4

a^+b^2

=4^2+5^2

=16+25

=41 your ans

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