Question 221214
Let  x  and  y  be  numbers
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x+y =50,,,,or  x= 50-y
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product  =  x*y = 400,,,,subst
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(50-y) * y = 400
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50y -y^2 =400
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0= y^2 -50y +400
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(y-10) (y-40) = 0
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y=10,  or,,,y=40
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whereas,,  x= 40  or  x=10
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therefore,,,numbers  are  10,,,and  40
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check  10+40 = 50,,,ok,,,,,,10*40 = 400,,,ok
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