# SOLUTION: A rectangular box has dimensions 4ft by 5ft by 5ft. Increasing each dimension of the box by the same amount yields a new box with volume seven times the old. Find how much each dim

Algebra ->  Algebra  -> Polynomials-and-rational-expressions -> SOLUTION: A rectangular box has dimensions 4ft by 5ft by 5ft. Increasing each dimension of the box by the same amount yields a new box with volume seven times the old. Find how much each dim      Log On

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 Question 274690: A rectangular box has dimensions 4ft by 5ft by 5ft. Increasing each dimension of the box by the same amount yields a new box with volume seven times the old. Find how much each dimension of the orginal box was increased to create the new box. Round your answer to two decimal places. This is where I started: 0= x^3+20x^2 ---->this part isn't finished, I don't understand how to get it...please help. Thank You!Answer by JBarnum(2044)   (Show Source): You can put this solution on YOUR website! x=-14,x=120/13 since x cant be a negative number, then x = 9.230769repeating each was increased by check if it was increased by 4.22 it would=698 hmmm for some reason i failed to calculate things correctly but by doing guess and check i came to the conclusion of 4.23