3 years ago

What is the value of the product (3-21) (3 + 21)?

Mathematics

1 answer:

stepladder [879]3 years ago

8 0

Multiply the two brackets together

(3-21)(3+21)

(3)(3)(3)(+21)(-21)(3)(-21*21)

9+63-63-441

- 441 because whenever multiplying a - negative number and a + positive number = - negative number

9-441

= -432

Answer: -432

You might be interested in

What is the surface area of this rectangular prism?

stira [4]

i think the answer is A.

8 0

2 years ago

Read 2 more answers

Need help with these questions, please

Zinaida [17]

Number 29 would be y=-x +10

8 0

3 years ago

after spending 7/9 of a three hours examination, a student left the exams hall. How many minutes has he to complete the duration

Montano1993 [528]

40 mins left! total time= 60 mins x 3 hours =180 mins. 180 divided by 9 is 20. 20 times 7 is 140. 180-140 equals 40. yay!

6 0

2 years ago

Pls help I dont get it

iragen [17]

Answer:

y=4x

Step-by-step explanation:

The equation of a line is y=mx+b, where m is the slope and b is the y intercept.

The slope formula is Δy/Δx, so using the coordinates (1, 4) and (2, 8), the slope is $\frac{8-4}{2-1}$ which equals 4.

The y intercept is 0.

Therefore, the equation is y=4x.

8 0

3 years ago

Help fast please!!!!!!!!

MArishka [77]

Step-by-step explanation:

The area is

${x}^{2} - 110x + 2800 \\ = {x}^{2} - 40x - 70x + 2800 \\ = x(x - 40) - 70(x - 40) \\ = (x - 40)(x - 70)$

Since the width is

$x - 40 \: (feet)$

Then, the length will be

$x - 70 \: (feet)$

4 0

2 years ago