Question

if a+b =10 and ab=21
find tha value of a^2 + b^2
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Answer 1

a = 3,b=7 or

a= 7,b = 3...........

a²+b² = 3²+7² = 9+49 = 58.......

Answer 2

a+b=10

ab=21

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

(10)square=a2+b2+2*21

100=a2+b2+42

100-42=a2+b2

58=a2+b2