Question

9. If a - b = 4 and a + b = 6; find :
(i) a2 +b2
(ii) ab​

Answer 1

Answer:

a-b=4......i

a+b=6........ii

add i and ii

2a=10

a=5

put a in i

b=1

a2+b2=25+1=26

ab=5*1=5

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Answer 2

Answer:

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Step-by-step explanation:

=>(a-b) ^2=(a+b)^2-4ab

=>(4)^2=(6)^2-4ab

=>16=36-4ab

=>16-36=-4ab

=>-20=-4ab

=>ab=-20/-4

=5

(a+b)^2=a^2+b^2+2ab

=>(6)^2=a^2+b^2+2*5

=>36=a^2+b^2+10

=>36-10=a^2+b^2

=>a^2+b^2=26