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VashaNatasha [74]
4 years ago
6

Solve and check the answers in the original equation

Mathematics
1 answer:
Scrat [10]4 years ago
3 0
 12 + 5k + 15                     -24
------------------- =  -----------------------
      k + 3                      k - 4
 5k + 27              -24
------------ =  ---------------
  k + 3                k - 4

 (k - 4)(5k + 27) = -24 (k + 3)
5k^2 - 20k + 27k -108 = - 24k - 72
5k^2 + 31k - 36 = 0
(5k + 36)(k - 1) = 0

5k + 36 = 0; k = -36/5 = -7.2
k - 1 = 0; k = 1

solutions
k = 1 and k = -7.2

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Answer:

18%

Step-by-step explanation:

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8 0
3 years ago
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erma4kov [3.2K]

Answer:

The correct options are;

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Step-by-step explanation:

The given function is f(x) = 9·x² + 54·x - 66

The extremum of the function are found as follows;

d(f(x))/dx = 0 = d(9·x² + 54·x - 66)/dx = 18·x + 54

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6 0
3 years ago
How do you solve the system of linear equations by graphing<br> X+y=7<br> -x+y=-7
morpeh [17]

Answer:

x = 7 and y = 0

Step-by-step explanation:

We can either solve by substitution method or by elimination method or both method . We will solve by both the elimination and substitution method.

X+y=7  ---------------------------------------------------(1)

-x+y=-7  -------------------------------------------------(2)

Subtract equation (2) from equation(1)

2x = 14

Divide both-side of the equation by 2

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Substitute x = 7 into equation (1)

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8 0
4 years ago
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Bingel [31]

Answer:

-3

Step-by-step explanation:

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y = ½x - 3

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8 0
4 years ago
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