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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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horsena [70]
From the table we can see:
Number of songs:         Cost:
          0                         $ 0
          1                         $1.25
          2                         $2.50
          3                         $3.75
          4                         $5.00
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Answer:
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3 0
3 years ago
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Find the measure of angle 1
quester [9]

Answer:

120 degrees

Step-by-step explanation:

You can just eyeball that it is greater than 90 degreees so it must be 120 degrees.

4 0
2 years ago
Write "five more than a number" as a math expression help please
sp2606 [1]

Answer:

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Step-by-step explanation:

8 0
2 years ago
1/3 (x - 10) = -4, x <br><br> What is x equal to?
Mrrafil [7]

A n s w e r :

x  =  - 2

5 0
2 years ago
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Thu wants to play "guess my number".she states,"when I triple my number and add five,I get twenty-six. What's my number?" what i
Mama L [17]
Let's break this up:
let x = the number
"when I triple my number" is the same as
3x
"and add five" is the same as
+5
We combine it to get
3x+5
"I get twenty-six"
=26
combine to get
3x+5=26
Now we just solve:
subtract 5 from both sides to get
3x=21
divide by 3 to get
x=7
6 0
3 years ago
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