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iragen [17]
4 years ago
12

I need help plz help me

Mathematics
1 answer:
Andrej [43]4 years ago
3 0

Answer:

Step-by-step explanation:

It appears to be the last step there that has evaded you.  In the second line of work, you can see that what's in each set of parenthesis is exactly the same.  Because of this, it is common and can be factored out.  What's left is the 4x and the +5:

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

That's factoring by grouping.  It only works with polynomials that have an even number of terms so you can group them together in 2's.

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A security fence encloses a rectangular area on one side of a park in a city. three sides of fencing are? used, since the fourth
alexandr1967 [171]
Let x = length of the park
Let y = width of the park

Because the area is 392392 ft², therefore
xy = 392392          (1)
Because three sides of fencing measure 5656 ft, therefore
2x + y = 5656        (2)
That is
y = 5656 - 2x          (3)
Substitute (3) into (1).
x(5656 - 2x) = 392392
5656x - 2x² = 392392
2x² -5656x + 392392 = 0
x² - 2828x + 196196 = 0

Solve with the quadratic formula.
x = (1/2)*[2828 +/- √(2828² - 4*196196)]
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Answer:
The possible dimensions are 2756.8 ft and 71.2 ft (nearest tenth)
3 0
3 years ago
The perimeter of a rectangle is 14cm. The length of the rectangle is 4 cm more than twice the width. Find the dimensions of the
sasho [114]

Answer:

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Step-by-step explanation:

l = length

w = width

l = 4 + 2w

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l = 4 + 2(1)

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2500cm=25m
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Hence the longest is 2km=2000m
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6 0
3 years ago
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