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dezoksy [38]
3 years ago
8

Solve quadratic equation x²-8x-1=0 by formula method​

Mathematics
2 answers:
Alex_Xolod [135]3 years ago
6 0

Answer:

x²-8x-1=0

comparing above equation with ax²+bx+c=0

a=1

b=-8

c=-1

x=

x =  \frac{ - b +  -  \sqrt{ {b}^{2} - 4ac } }{2a}

=(--8+-√(64-4×1×-1)/2×1

=8+-√(64+4)/2

taking positive

x=(8+√68)/2=2(4+√17)/2=4+√17

taking negative

x=(8-√68)/2=2(4-√17)/2=4-√17

Ad libitum [116K]3 years ago
3 0

maybe be it's right.....

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Answer:

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Step-by-step explanation:

-4(y-2)=12

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8 0
3 years ago
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Answer:

c. $10.56

Step-by-step explanation:

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4 0
3 years ago
Montrey recently paid off his simple interest loan. If he borrowed $6,500 for 5 years at 7%, what was the total amount he had to
erica [24]

9514 1404 393

Answer:

  $8,775

Step-by-step explanation:

The amount due is given by the formula ...

  A = P(1 +rt)

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  A = $6,500(1 +0.07×5) = $6,500(1.35) = $8,775

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6 0
3 years ago
What is the arithmetic sequence in this problem . help plz
adell [148]

Answer:

<u>a(n)=80*(9/10)^(n-1)</u>

Step-by-step explanation:

I think u r confused

this sequence is geometric not arithmetic

HOw we know that ??

when we get a common difference  <u>that must Be equal  </u>

d=72-80=-8  not equal to  d=64.8-72=-7.2

So it is not arithmetic

but when we get the common ratio that also must <u>be equal </u>

r=72/80=9/10 equal to   r=64.8/72=9/10

So it is geometric

By using this equation:

a(n)=a*r^(n-1)

and we have <u>a=80 , r=9/10</u>

Then       <u>a(n)=80*(9/10)^(n-1)</u>

<em>I really hope this helps <3</em>

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3 years ago
The values of sine and cosine are always between 0 and 1. True or False
o-na [289]

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The length of the sides of a right triangle are always less than the length of the hypotenuse.

Also, the ratio of any side of a triangle and the hypotenuse is always less than 1.

3 0
3 years ago
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