All categories

3 years ago

If x+4 is a factor of x^2+bx+20, what is the value of b?

1 answer:

lina2011 [118]3 years ago

3 0

If a factor is x+4, that means that the coefficient of x^2 (the number in front of it, which would be 1) and that 20 should be divisible by 20. Now, if you divide 20 by 4, you would get 5, and 1/1 = 1. So, the 2 factors you have is

(x+4)(x+5)

When you FOIL, you would get
x^2+9x+20, which means

b=9

You might be interested in

Find the length of diagonal AC in the rectangle at the right show you’re work plss

ivolga24 [154]

Answer:

Step-by-step explanation:

Let 10 be a, and 24 be b, and the undefined hypotenuse be c.

$a^2 + b^2 = c^2$

$10^2 + 24^2 = c^2$

100 + 576 = c

c = 676

$\sqrt{100} + \sqrt{576} = \sqrt{676}$

$10^2 + 24^2 = 26^2$

c = 26

The value of the undefined line is 26.

7 0

3 years ago

Helpppppppp neededddd

ozzi

Answer:

Adam

Step-by-step explanation:

Speed is calculated with the formula distance over time.

Convert all measurements to the same unit: ft/s.

Speed of Frank:

d/t

=11/s

Speed of Emily:

d/t

=86/10

=8.6/s

Speed of Adam:

There are 5280 feet in a mile.

d/t

=5280/388

=13.6/s

Speed of Noah:

There are 60 seconds in a minute.

d/t

=600/60

=10/s

Adam runs the fastest because 13.6 > 11 > 10 > 8.6.

8 0

2 years ago

Approximate: log 5 ^4/7

wolverine [178]

Do you mean the following:

log(5^(4/7))=around 0.4

log(5)^(4/7)=around 0.815

log(5^4)/7= same thing as top one

log((5^4)/7)=around 1.95

6 0

3 years ago

Read 2 more answers

Find the sum of the reciprocals of two consecutive even integers if the larger integer is x. please answer;-;

Harman [31]

Step-by-step explanation:

Let the larger integer be x

Hence, the smaller integer = x-2

Hence,

Reciprocal of the x= 1/x

Reciprocal of x-2= 1/ x-2

Hence. their sum=

$\frac{1}{x} + \frac{1}{x - 2} \\ = \frac{x - 2 + x}{x(x - 2)} \\ = \frac{2x - 2}{ {x}^{2} - 2x}$

4 0

3 years ago

Side length 6cm ,6cm, 4cm. How many different triangles can you make ?

Klio2033 [76]

Answer:

Technically, one (they equal the same thing) but 2 in this case.

Step-by-step explanation:

6 + 6 + 4

6 + 4 + 6

7 0

3 years ago

Read 2 more answers