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DochEvi [55]
2 years ago
12

(b) Given that

Mathematics
1 answer:
Gnesinka [82]2 years ago
4 0

Answer:n=-2 or n=4

Step-by-step explanation:

Q is not inversible if det(Q)=0

\left|\begin{array}{ccc}6&7&-1\\3&n&5\\9&11&n\end{array}\right| =0\\\\\\\\6(n^2-55)-3(7n+11)+9(35+n)=0\\\\n^2-2n-8=0\\\\\Delta=36=6^2\\\\n=\dfrac{2-6}{2} =-2\ or\  n=\dfrac{2+6}{2}=4\\

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3 years ago
What is 16+2 and 18-3 and 2*3?
stepladder [879]

Answer:

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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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Rhett is solving the quadratic equation zero equals X2 minus 2X -3 using the quadratic formula which shows the correct substitut
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x = - (-2) +/- sqrt (-2)^2 - 4(1)(-3)
      --------------------------------------
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 x = + 2 +/- sqrt [(4) - 4(-3)]
       -------------------------------
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       --------------------------
                   2
x = +2 +/- sqrt[16]
      -------------------
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x = +2 +/- (4)
      -------------
             2

x = 2 + 4    or 2 -4 
      -------        ------
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x = 6/2      or   -2/2

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2 years ago
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Step-by-step explanation:

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