SOLUTION: the sum of the square of a number and five times the number is 84.find the number

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Question 855998: the sum of the square of a number and five times the number is 84.find the number
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
let the number be x
x^2+5x=84
x^2+5x-84
x^2+12x-7x-84=0
x(x+12)-7(x+12)=0
(x+12)(x-7)=0
x=-12 OR x=7