352,567 views
19 votes
19 votes
3 cm

x cm
В.
x cm
The area of rectangle ABCD is 9 cm?.
Show that x? + 5x = 3
2 cm
А
D
+

User JeffV
by
3.2k points

1 Answer

15 votes
15 votes

Answer: The rectangle has been divided into a square and three rectangles.

The area of

a square = (x)(x) = x²

a rectangle #1 = (2)(x) = 2x

a rectangle #2 = (3)(x) = 3x

a rectangle #3 = (2)(3) = 6

The area of a large rectangle is the sum of the square area and three rectangles, and is 9 cm². Therefore we have the equation:

x² + 2x + 3x + 6 = 9 subtract 6 from both sides

x² + 5x + 6 - 6 = 9 - 6

x² + 5x = 3

Explanation:

User Alex Libov
by
3.0k points
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