Question

what is the value of a²+b² if a+b=9 and ab=20​

Answer 1

Answer:

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Answer 2

$\large \rightarrow{a}^{2} + {b}^{2} = {(a + b) }^{2} - 2ab$

$\rightarrow \large \: \: \: {9}^{2} - 2(20)$

$\rightarrow \large {81 - 40}$

$\rightarrow \large \: \: \orange {41}$