Question

If a+b =9 and ab=20 then find the value

Answer 1

firstly find all the possible number
if
a=4
b=5
then 4+5=9
4*5=20

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it satisfies both condition

Answer 2

(a+b) = 9

squaring both side we get

${(a + b)}^{2} = {a}^{2} + {b}^{2} + 2ab$
substituting the values we get

${a}^{2} + {b}^{2} =$
81 -40

41