SOLUTION: One positive integer is 5 less than 4 times another. Their product is 21. Find the integers

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Question 283802: One positive integer is 5 less than 4 times another. Their product is 21. Find the integers
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
let one integer be x
four times integer = 4x
4x-5 is the second number
x(4x-5)=21
4x^2-5x-21=0
4x^2-12x+7x-21=0
4x(x-3)+7(x-3)=0
(x-3)(4x+7)=0
SO x= 3 or -7/4
but the integer is positive so x=3
the other number = 12