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inessss [21]
3 years ago
6

If x=-7 is a root of the equation x^2+kx+49=0, then k=​

Mathematics
1 answer:
aleksley [76]3 years ago
8 0

Answer:

k=14

Step-by-step explanation:

Given:

x^{2}+kx+49 = 0

x = -7

Substitution can be used to find the value of k:

(-7)^{2}+(-7)k+49 = 0

49-7k+49 = 0

98 -7k = 0

k = 14

Hope this helps :)

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I could use some help doing this simple math problem lol.
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k-9=(-1+\sqrt k)^2\\
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HELP!!!!!!! WILL MARK BRAINLIEST.<br> See attachment.
creativ13 [48]

Answer:

Humberto multiplied 4 by 3, but that is incorrect, you are supposed to first do 3^2 and the multiply the answer by 4 to get 36.

The correct value is:  36

Step-by-step explanation:

<u>Step 1:  Set t to 3</u>

4t^2

4(3)^2

4(9) -> Correct way

36 -> Correct

<u>Humberto</u>

4(3)^2

(12)^2 -> Made mistake

144 -> Incorrect

Humberto multiplied 4 by 3, but that is incorrect, you are supposed to first do 3^2 and the multiply the answer by 4 to get 36.

The correct value is:  36

5 0
3 years ago
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