SOLUTION: The perimeter of one square is 12cm larger than that of another square,and it's area exceeds the area of the other by 39 square centimeters. Find the length of the side of each squ

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Question 1106008: The perimeter of one square is 12cm larger than that of another square,and it's area exceeds the area of the other by 39 square centimeters. Find the length of the side of each square.
Answer by ankor@dixie-net.com(22740) (Show Source):
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let x = side of the 1st square
let y = side of the 2nd square
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Write an equation for each statement
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The perimeter of one square is 12cm larger than that of another square,
4x - 4y = 12
simplify, divide by 4
x - y = 3
x = y + 3
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and it's area exceeds the area of the other by 39 square centimeters.
x^2 - y^2 = 39
replace x with (y+3)
(y+3)^2 - y^2 = 39
FOIL
y^2 + 6y + 9 - y^2 = 39
combine like terms
6y = 39 - 9
6y = 30
y = 30/6
y = 5 cm, side of the 2nd square
Find x
x - 5 = 3
x = 3 + 5
x = 8 cm, side of the 1st square
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Find the length of the side of each square. 8 & 5
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Check this in the 2nd equation
8^2 - 5^2 =
64 - 25 = 39