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luda_lava [24]
3 years ago
11

A rectangle with an area of 120 in2 has a length 8 inches longer than two times its width. What is the width of the rectangle

Mathematics
2 answers:
Anni [7]3 years ago
6 0
Answer:

6 inches

Explanation:

Area of a rectangle with length, l and breadth, b = <span>l⋅b</span>

Given <span>l=2b+8</span> and <span>A=120</span>

Area A = <span>l⋅b=<span>(2b+8)</span>⋅b=2<span>b2</span>+8b=120</span> =>

<span><span>2<span>b2</span>+8b−120=0</span> =><span><span>b2</span>+4b−60=0</span> =><span><span>b2</span>+10b−6b−60=0</span> =><span>b<span>(b+10)</span>−6<span>(b+10)</span>=0</span> =><span><span>(b−6)</span><span>(b+10)</span>=0</span>; =><span>b=6</span> as b cannot be <span>−10</span>.</span>

Width is 6 inches

Westkost [7]3 years ago
6 0
L x W = 120
L = 2 x W + 8

(2W + 8) x (W) = 120
2W^2 + 8W = 120
W^2 + 4W - 60 = 0
(W+ 10) x (W-6) = 0
W= -10, 6 
(( shouldn't be negative, so therefore W = 6 )) 
 
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