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nalin [4]
3 years ago
12

HELP ASAP!

Mathematics
2 answers:
9966 [12]3 years ago
8 0

Answer:

5.69 feet by 19.69 feet

Step-by-step explanation:

Given : A gardener wants to create a rectangular vegetable garden in a backyard. He wants it to have a total area of 112 square feet, and it should be 14 feet longer than it is wide.

Let x be the breadth of the rectangular vegetable garden

So, length of the rectangular vegetable garden  = ( x + 14 ) feet

To find: dimensions that a gardener should use for the vegetable garden

Solution :

We know that area of the rectangle is equal to length ( l ) × breadth ( b )

Area of the rectangular garden = 112 square feet

According to question,

x(x+14)=112\Rightarrow x^2+14x-112=0

In order to find roots, use quadratic formula which states that for equation ax^2+bx+c=0, roots are \frac{-b\pm \sqrt{b^2-4ac}}{2a}

Therefore, for equation x^2+14x-112=0, roots are \frac{-14\pm \sqrt{196+448}}{2}=\frac{-14\pm \sqrt{644}}{2}

Being a dimension, breadth can not be negative, so x = \frac{-14- \sqrt{644}}{2} is rejected

Therefore,

x=\frac{-14+ \sqrt{644}}{2}=5.69\Rightarrow l = x+14=5.69+14=19.69

So, length = 19.69 feet and breadth = 5.69 feet

ElenaW [278]3 years ago
6 0
It is C because  5.69 multiplied by 19.69 equals 112.0361 Square Foot
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