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ivann1987 [24]
3 years ago
13

-x2 + x-1=0

Mathematics
2 answers:
tia_tia [17]3 years ago
5 0
<span>-x^2 + x-1=0 divide by (-) </span><span><span> 
</span>
 </span><span>x^2-x+1=0 </span><span><span> 
</span>
 </span><span>x=1/2(+-) root of (1/2)^2-1 </span><span><span> 
</span>
 </span><span>x=1/2(+-) root of (1/4)-1 </span><span><span> 
</span> </span><span><span> 
</span></span><span>x=1/2(+-) root of (1/4)-1 </span>  
<span>
x=1/2(+-) root of (1/4)-((4*1)/4)  </span> 
<span>
x=1/2(+-) root of (-3/4)   
</span>
 <span>which has not answers, because we can  not take a root of negatives numbers</span>
igomit [66]3 years ago
4 0
Ax² + bx + c = 0
-x² + x - 1= 0
x = <u>-b +/- √b² - 4ac</u>
                2a
x = <u>-1 +/- √1² - 4(-1)(-1)</u>
                  2(-1)
x = <u>-1 +/- √1 - 4</u>
             -2
x = <u>-1 +/- √-3</u>
            -2
x = <u>-1 +/- (-1.732050808)</u>
                  -2
x = <u>-1 - 1.732050808</u>        x = <u>-1 + 1.732050808</u>
                 -2                                      -2
x = <u>-2.732050808</u>             x = <u>0.732050808</u>
              -2                                     -2
x = 1.366025404              x = 0.366025404
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Why can 3+4 be written as 3 + 3 + 1
maks197457 [2]
Because 3+3+1= 7 which is the same number 3+4 is equal to. Another reason is any number can be broken down into smaller numbers that equal the whole. 
4 0
3 years ago
Read 2 more answers
C = 200 – 7x + 0.345x2 find the domain and range of C.
Mkey [24]

Answer:

Domain: (-\infty,\infty)

Range: [164.493,\infty)

Step-by-step explanation:

The domain is all x-values. Since it doesn't matter what you put in for x, all real numbers work.

The range is all y-values. Since the leading coefficient of 0.345 is positive, this means we need to find the absolute minimum by using the formula x=-\frac{b}{2a} and then determining what C is given the value of x:

x=-\frac{b}{2a}

x=-\frac{-7}{2(0.345)}

x\approx10.145

Therefore:

C=200-7x+0.345x^2

C=200-7(10.145)+0.345(10.145)^2

C\approx164.493 is the absolute minimum

7 0
2 years ago
A slope has a height of 7m a base of 24m and a length of 22m what is the volume of the slope?​
Verizon [17]

Answer:

the answer is 3,696

Step-by-step explanation:

all you have to do is multiply hieght length and the 22m anf multiply thoes together and you have your answer

4 0
3 years ago
Which point is the best estimate of 11?
Likurg_2 [28]

Answer:

B

Step-by-step explanation:

Step 1: Find √11

√11 is between perfect squares √9 and √16

√9 < √11 < √16

3 < √11 < 4

So it is between 3 and 4

Step 2: Evaluate

√11 = 3.31662

Closest dot is B.

6 0
3 years ago
5. Is the sequence arithmetic? If so, identify the common difference.
HACTEHA [7]
5.
aritmetic is same increase per term
14 to 21 is 7
21 to 42 is 21
7≠21
no


6.
decreases by 4 each time
an=a1+d(n-1)
an=10-4(n-1)
n=12 for 12th term
a12=10-4(12-1)
a12=10-4(11)
a12=10-44
a12=-34

it is -34



7.
missing term is y
22+n=y
y+n=34
22+n+n=34
22+2n=34
minus 22 from both sides
2n=12
divide both sides by 2
n=6
22+n=y
22+6=y
28=y

28 is answer



5. no
6. -34
7. 28
6 0
4 years ago
Read 2 more answers
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