3 years ago

What are the zeros of f(x)=x^2+x-20?

1 answer:

3 0

F(x) = x² + x - 20 = x² + 5x - 4x - 20 = x(x + 5) - 4(x + 5) = (x + 5)(x - 4)

f(x) = 0 ⇔ (x + 5)(x - 4) = 0 ⇔ x + 5 = 0 or x - 4 = 0 ⇒ x = -5 or x = 4

Answer: C. x = -5 and x = 4.

You might be interested in

What is (x+3)(x+8)=0

Dima020 [189]

The answer to the problem are -3 and -8 because the two equation are being solved for 0

6 0

3 years ago

Read 2 more answers

Martha is braiding a necklace for her friend. The graph below shows the length of the necklace with respect to the length of tim

USPshnik [31]

Answer:

a. L = 20t

Step-by-step explanation:

The length increases by 20 millimeters per minute

8 0

3 years ago

The reacttimes data set has 50 observations of human reaction times to a physical stimulus. The reaction times are named times a

scoundrel [369]

Solution: The formula for mean is:

$Mean=\frac{\sum x}{n}$

Where:

$\sum x$ is the sum of given observations

$n$ is the number of observations

$\sum x=87.12$

$n=50$

$\therefore Mean =\frac{87.12}{50}= 1.74$ rounded to two decimal places

To find the median, we need to first arrange the data in ascending order but we are already given the data in ascending order.

Therefore, the median is:

$Median=\left(\frac{n+1}{2} \right)^{th} item$

$=\left(\frac{51}{2} \right)^{th} item$

$=25.5^{th} item$

$=1.52+0.5(1.54-1.52)$

$=1.52+0.01$

$=1.53$

Therefore, the median = 1.53

4 0

2 years ago

5x = - 25x Solve for x

Sunny_sXe [5.5K]

Subtract 5x from both sides
0=-30x

Divide both sides by -30
0=x

Final answer: x=0

Hope this helps!

8 0

2 years ago

Read 2 more answers

WILL GIVE BRAINLIEST PLEASE HELP!!!

katovenus [111]

f(x)=2^(x-2) = 2^(-4) = 1/2^4 = 1/16

answer
A.
f(x)=2^(x-2)

8 0

2 years ago