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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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Adding mixed numbers. Can someone help me correct my answer?
Olin [163]

Answer:

27 13/60

Step-by-step explanation:

What you have tried to do is not an impossible way to do it. What you could do is set your fractions and whole numbers like this.

( 7 + 1/10) * (3 + 5/6) I don't know if you know what FOIL is, but that is the way to proceed.

  • First: (meaning the first in each factor ).   3 * 7 =                                    21
  • Outside: (meaning the two terms near outside the brackets) 7 * 5/6 = 5 5/6
  • Inside: The two terms closest to the * sign      1 / 10  *3 =                         3/10
  • Last: The two end terms    (1/10 * 5/6 = 5/60                                              5/60

Now you can add. 21 + 5 is the whole number amount = 26

Add the fractions

  • 5/6 + 3/10 + 5/60 The lowest common multiple is 60
  • 50/60 + 18/60 +5/60 = 73 / 60 = 1 and 13/60

Add that to 26 and you get 27 13/60

3 0
3 years ago
Candice needs a plumber and must decide between 2 companies. For a service visit, Company A charges $60 to send a plumber plus $
Ber [7]
Since they meet at the $105 mark the answer would be $105
7 0
3 years ago
OT + 7<br> E-<br> Write the number in the form a + bi
Umnica [9.8K]

Answer:

Use photomath and math away it help a lot.

Step-by-step explanation:

These apps helped me so much!! my grades went up with these apps!! :D

5 0
3 years ago
Show each single-step equation. Show your work. V/8 = 2
denis-greek [22]

Answer:   V = 16

=========================================================

Explanation:

The notation V/8 means we are dividing V over 8.

To isolate V, we undo this division by applying multiplication. We'll multiply both sides by 8 to get V = 2*8 = 16.

Replacing V with 16 will lead to a true equation

V/8 = 2

16/8 = 2

2 = 2

This helps confirm the answer.

8 0
3 years ago
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koban [17]

Hi there!

\large\boxed{\text{x = -1, x = 0, x = 5/2, x = 3}}

We can find the zeros of the polynomial by setting each factor equal to 0:

p(x) = 4x(x - 3)(x + 1)(2x - 5)

0 = 4x

x = 0

x - 3 = 0

x = 3

x + 1 = 0

x = -1

2x - 5 = 0

2x = 5

x = 5/2

Therefore, the zeros of this polynomial are:

x = -1, x = 0, x = 5/2, x = 3

7 0
3 years ago
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