Find mZLKM. м. M K/(3x – 70) 60° L mZLKM= l
1 answer:
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Answer:
B) maximum at 15
Step-by-step explanation:
Factor the leading coefficient from the first two terms.
-(x^2 +6x) +6
Add the square of half the x-coefficient inside parentheses and subtract the same quantity outside.
-(x^2 +6x +9) +6 -(-9)
-(x +3)^2 +15
Compared to the form
a(x -h)^2 +k
we find a=-1, h=-3, k=15. The negative vertical scale factor (a=-1) means the parabola opens downward. The vertex is located at (h, k) = (-3, 15).
The maximum value is 15.
Let's assume
length =l
width =w
we are given
the width of a rectangle is 7 feet less than its length
so, we get
now, we know that
area = length*width
now, we can plug w
we have
Area=170
now, we can factor it
now, we can solve for l
now, we can find width
so, dimensions are
...............Answer