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Maru [420]
3 years ago
9

A rectangle has an area of 209 square feet. The sides of the rectangle measure (4x-5) feet and (4x+3) feet. Find the dimensions

Mathematics
1 answer:
Nataly_w [17]3 years ago
8 0
-------------------------------------------------------------
Formula for Area :
-------------------------------------------------------------
Area = Length x Width

Since we know that the area is 209 ft² and the sides are (4x-5)ft and (4x+3) ft, we will plug in these values and solve for x.

209 = (4x-5)(4x + 3)

-------------------------------------------------------------
Expand the quadratic using FOIL:
-------------------------------------------------------------
209 = 16x² + 12x - 20x - 15

-------------------------------------------------------------
Combine like terms:
-------------------------------------------------------------
209 = 16x² - 8x - 15

-------------------------------------------------------------
Take away 209 from both sides :
-------------------------------------------------------------
0 = 6x² - 8x - 224

-------------------------------------------------------------
Switch Sides :
-------------------------------------------------------------
16x² - 8x - 224 = 0

-------------------------------------------------------------
Divide by 8 through :
-------------------------------------------------------------
2x² - x - 28 = 0

-------------------------------------------------------------
Factoise :
-------------------------------------------------------------
(2x + 7) (x - 4) = 0

-------------------------------------------------------------
Apply zero product property:
-------------------------------------------------------------
2x + 7 = 0 or x - 4  = 0
x = -7/2 (rejected) or x = 4

-------------------------------------------------------------
Find the 2 sides :
-------------------------------------------------------------
(4x - 5) = (4(4) - 5) = 11 ft
(4x + 3) = (4(4) + 3)  = 19 ft

-------------------------------------------------------------
Answer: The dimensions are 11 ft by 19 ft.
-------------------------------------------------------------








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