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Question 821536: One number is 4 more than 2 times another. Their product is 30 . Find the numbers. Answer in the form of paired points with the lowest of the two numbers first.
Answer by TimothyLamb(4379)   (Show Source):
You can put this solution on YOUR website! ---
x = 2y + 4
xy = 30
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xy = 30
(2y + 4)y = 30
2yy + 4y - 30 = 0
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the above quadratic equation is in standard form, with a=2, b=4, and c=-30
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to solve the quadratic equation, by using the quadratic formula, copy and paste this:
2 4 -30
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the two real roots (i.e. the two x-intercepts), of the quadratic are:
y = 3
y = -5
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this problem has two answers, the numbers are:
3, 10
or
-6, -5
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