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aev [14]
3 years ago
8

For what values of K does x2+kx+9=0

Mathematics
1 answer:
Airida [17]3 years ago
4 0

Answer:

k = 6

Step-by-step explanation:

x {}^{2}  + kx + 9 = 0

here,

a = 1,

b = k

c = 9

now,

D = b {}^{2}  - 4ac

k {}^{2}  - 4(1)(9) = 0 \\   k {}^{2}  - 36 = 0 \\ k {}^{2}  = 36 \\ k = 6

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Given f(x) = -x + 2, find f(-1)
jarptica [38.1K]

f(x) = -x + 2

f(-1)   This means that they want you to find the value of f(x) or y when x = -1.

f(x) = -x + 2     Substitute/plug in -1 into "x" since x = -1

f(-1) = -(-1) + 2     (two negative signs cancel each other out and become positive)

f(-1) = 1 + 2

f(-1) = 3

3 0
4 years ago
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Maslowich
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one way is to just take the derivitive

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an easier way would be to have

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answer is 3
7 0
4 years ago
Mary received a $16 discount on a $64 dress. what percent discount did Mary receive?
Ilia_Sergeevich [38]

Answer:

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8 0
3 years ago
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Answer:

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Step-by-step explanation:

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So..

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6 0
2 years ago
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