If the square of a positive integer is added to 55 times the integer, the result is 336336. find the integer.

The square of a positive integer added to 4 times the integer is 437..

x2 + 4x = 437

I chose to do this by completing the square..

x2+4x+4 = 437 + 4
(x+2)2 = 441
Take square root of both sides

x+2 = ±√441
x = -2 ± 21

x = -23 or x = 19
x = 19

The value after 0 years = $ 800The value after 1 year = $600The value after 2 years = $450The value after 3 years = $337.5The value after n years = computer cost at (n-1) year -

Step-by-step explanation:

The cost of computer = $ 800

It losed 1/4th of value every year.

The value of computer after 0 years = cost of computer = $ 800

The value after 1 year = 800 - ( ) = $600

The value after 2 years = 600 - ( ) = $450

The value after 3 years = 450 - ( ) = $337.5

The value after n years = computer cost at (n-1) year -