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Semenov [28]
3 years ago
8

How do you solve x^2 plus 16x plus 63=0?

Mathematics
1 answer:
Alex3 years ago
8 0
x^2+ 16x + 63=0 \\ \\a=1, \ b=16 , \ c=63 \\ \\ \Delta =b^2-4ac =16^2 -4\cdot1\cdot 63 = 256 -252 = 4 \\ \\x_{1}=\frac{-b-\Delta }{2a}=\frac{-16-\sqrt{4}}{2 }=\frac{-16-2}{2}=-\frac{-18}{2}=-9 \\ \\x_{2}=\frac{-b+\Delta }{2a}=\frac{-16+\sqrt{4}}{2 }=\frac{-16+2}{2}=-\frac{-14}{2}=-7 \\ \\ \\Answer : \ x= -7 \ \ or \ \ x= -9
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Isabella ran a lemonade stall at a school festival. She made a $10 profit in the first hour, a $ 25 loss in the second hour, and
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Answer:

$8 loss

Step-by-step explanation:

$10 profits, $7 profits, $25 loss

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4 0
3 years ago
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Anon25 [30]

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Step-by-step explanation:

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2 years ago
Convert the linear equation 8x − 2y = 12 into function form.
alex41 [277]

Answer:

y=4x-6

Step-by-step explanation:

8x-2y=12

8x-2y-12=0

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8 0
2 years ago
I need to find the limit
Digiron [165]
For x=\dfrac{1}{2} the function is undefined.

\displaystyle
\lim_{x\to\tfrac{1}{2}^-} x\sec (\pi x)=\infty\\
\lim_{x\to\tfrac{1}{2}^+} x\sec (\pi x)=-\infty\\\\
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So, the limit doesn't exist.
8 0
2 years ago
A square field has an area of 144 metres squared. If Andrea walked 10 times around this field, what distance did she cover?
Novosadov [1.4K]

Answer:

480m

Step-by-step explanation:

First we have to find the perimeter of the field.

We know that the area is 144m and that the field is a square.

Since a squares sides are all equal, we can do \sqrt{144}, which is 12m.

So, one side of the field is 12m; now we just find the perimeter which is easy since its a square. 12*4=48m

If Andrea walked around it 10 times, then we just multiply the perimeter by 10

48*10=480m

7 0
2 years ago
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