All categories

3 years ago

Pls help u dont have to explain that much

Mathematics

1 answer:

ira [324]3 years ago

3 0

Answer:

k = -7

Step-by-step explanation:

Given

x² - x - 42 = (x + k)(x + 6)

Required

Find k

x² - x - 42 = (x + k)(x + 6)

Expand the left hand side

x²-7x + 6x - 42 = (x + k)(x+ 6)

Factorize

x(x - 7) + 6(x- 7) = (x + k)(x+ 6)

Further factorize

(x - 7)(x + 6) = (x + k)(x + 6)

By comparison

x + k = x - 7

Subtract x from both sides

k = -7

You might be interested in

A student solved this problem by working backwards. Joani has some stuffed animals. She has 2 times as many as Lily. Lily has 6

kramer

3x4=12 gives him 12 baseballs. he has 5 fewer tennis balls than base balls so you subtract 5 from 12 and you get 7 tennis balls.

5 0

2 years ago

Can somebody help me answer these plz?

Snezhnost [94]

number 2 would be 43

number 3 would be 40

5 0

3 years ago

Is a rectangle. EA is 12 in. Find the length of the diagonal .

Maurinko [17]

Answer:

hey please saw the figure

6 0

3 years ago

Denise gets 450 minutes each month to use on her cell phone. Last month, she used 360 minutes. What percent of her minutes did s

guajiro [1.7K]

Answer:

80%

Step-by-step explanation:

Denise used 360 minutes out of 450 minutes. You would set this up as a fraction. Then, you would have to find out the percentage of how much Denise used. You would put 360/450 across from x/100. You find the value of x by multiplying 360*100 which equals 36000. You then would divide it by 450 to get a product of 80. This is how you would get 80%.

8 0

3 years ago

Read 2 more answers

Wetlands are important ecosystems for many reasons. Select all that apply.

OlgaM077 [116]

Answer:

A and B

Step-by-step explanation:

the bottom 2 don't make sense

7 0

3 years ago

Pls help u dont have to explain that much​

Pls help u dont have to explain that much