SOLUTION: The sum of two numbers is thirteen and their product is 21. Find the two numbers

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Question 723563:

The sum of two numbers is thirteen and their product is 21. Find the two numbers
Answer by checkley79(3341) About Me  (Show Source):
You can put this solution on YOUR website!
X+Y=13
X=13-Y
XY=21
(13-Y)Y=21
13Y-Y^2=21
-Y^2+13Y-21=0
Y^2-13Y+21=0
x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+
X=(13+-SQRT(-13^2-4*1*21))/2*1
X=(13+-SQRT(169-94))/2
X=(13+-SQRT85)/2
X=(13+-9.22)/2
X=(13+9.22)/2
X=22.22/2
X=11.11 ANS
X=(13-9.22)/2
X=3.78/2
X=1.89 ANS.