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NeX [460]
3 years ago
13

What is x squared plus six x minus twenty seven =0

Mathematics
1 answer:
marishachu [46]3 years ago
8 0
x^2+6x-27=0\\\\x^2-3x+9x-27=0\\\\x\big(x-3\big)+9\big(x-3\big)=0\\\\\big(x+9\big)\big(x-3\big)=0\\\\\\x+9=0\qquad\vee\qquad x-3=0\\\\\boxed{x=-9\qquad\vee\qquad x=3}
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Find the value of x cubed minus 2x squared minus 7x + 5 of x=1/2-√3 ​
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9514 1404 393

Answer:

  3

Step-by-step explanation:

For f(x) = x^3 -2x^2 -7x +5 and x=1/(2-√3), we have ...

  f(x) = ((x -2)x -7)x +5

and ...

  x = 1/(2-√3) = (2+√3)/(2^2 -3) = 2+√3

Then ...

  f(2+√3) = ((2 +√3 -2)(2 +√3) -7)(2 +√3) +5

  = (3+2√3 -7)(2+√3) +5

  = 2(√3 -2)(√3 +2) +5 = 2(3 -4) +5 = -2 +5

  f(1/(2 -√3)) = 3

_____

If you really mean x = (1/2) -√3, then f(x) = (42√3 -3)/8.

6 0
2 years ago
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Artist 52 [7]

Answer:

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Step-by-step explanation:

3 0
3 years ago
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How can you generate x-3y+5 from the expression x+y+4+2y+1
vladimir2022 [97]

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Step-by-step explanation:

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now you have: x+3y+5

if you do not understand, What i am trying to say is, you need to add all of the same things.

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8 0
2 years ago
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