SOLUTION: If the square of a positive integer is added to 3 times the integer, the results is 40. Find the integer.
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Question 889275: If the square of a positive integer is added to 3 times the integer, the results is 40. Find the integer.
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
let the number be x
x^2+3x=40
x^2+3x-40=0
x^2+8x-5x-40=0
x(x+8)-5(x+8)=0
(x+8)(x-5)=0
x=-8 OR x=5
but number is positive
so the number is 5
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