Seventh-grade Mathematics (Beijing Normal University Edition) Volume II Chapter I Arithmetic Unit Test of Algebraic Expressions (Volume B) - Training Enrollment Network

Seventh-grade Mathematics (Beijing Normal University Edition) Volume II Chapter I Arithmetic Unit Test of Algebraic Expressions (Volume B)

Let the original rectangle be x in length, y in width and XY in area. Because it became a square, Y+2=X-2, Y=X-4.

(Y+2)*(X-2)=3XY

(X-2)^2=3X *(X-4)

X^2-4X+4=3X^2- 12X

2x^2-8x-4=0

x^2-4x+4=6

(x-2)^2=6

The square root of x = 6+2

Y = the square root of 6-2

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