Question

the sum of the numbers a and b is 9 and their product is 20 , find a square plus b square​

Answer 1

1st see the numbers

a+b=9

so let a =4 and b=5

5+4=9

5×4=20

find (a+b)*2

so (4+5)*2

a*2+b*2+2ab

4*2+5*2+2×4×5

16+25+40

=81

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Answer 2

Step-by-step explanation:

see the picture you can find your answer