Factor the following polynomial completely. -x^2y^2 + x^4 + 9y^2 - 9x^2

Answers

Answer 1

Answer: move the pure terms to outside

x^4-9x^2-x^2y^2+9y^2
grop
(x^4-x^2y^2)+(-9x^2+9y^2)
undistribute common factors
(x^2)(x^2-y^2)+(-9)(x^2-y^2)
reverse distributive
(x^2-y^2)(x^2-9)
factor perfect squares
(x-y)(x+y)(x-3)(x+3)

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Need help plz!!XY = -4

a teacher needs 70 lengths of string cut to 40 cm each. If balls of string are 10 m long how many balls will be needed

Answers

The balls need for the given question is 28.

Given-

Total required string is 70.

The length of the required string is 40 cm.

The length of the ball of string is 10 m.

Convert the length of ball in centimetre from meter. We know that one meter has hundredcentimetres. Thus ten meters is,

$=10* 100$

$=1000$

Hence the length of the ball of string is 1000 cm.

Now the string is cut thus we need two lengths of string. Therefore,

$=40* 2$

$=80$

Two length of string is 80 cm.

Now this is the half times the lengths of the seventy. Thus,

$=(70)/(2) *{80}$

$=2800$

For this 2800 cm string we need 1000 cm string balls $n$ are,

$n=(2800)/(1000)$

$n=28$

Hence, the balls need for the given question is 28.

For more about the units follow the link below-

brainly.com/question/15602440

A meter is 100 cm. A ball of string has 10m of string, and you multiply 10m by 100cm, you get 1,000cm. Then you multiply 40cm by 2, and you get 80cm, or two lengths of string. Then you multiply 35, which is half of 70, by 80, and that is 2,800 cm.
2,800÷40cm=70
And 100cm=1m.
The teacher will therefore need 28 balls of string.

Simplify.
3
(-4a64)
Write your answer without parentheses.

Answers

Answer:

64w2.

Step-by-step explanation:

Hi! Can somebody pls explain to me how to do one of these problems pls......will give brainliest lol

Answers

1. Y = -3x
2. Y = -2
3. Y= x + 2
4. Y = 2/3x -1

Answer:

1. Y = -3x

2. Y = -2

3. Y= x + 2

4. Y = 2/3x -1

I HAVE A FELLING

a + b +c = 10

a + b - c = 3

find the value of

a + b + 3c

Answers

ok if you look at the first to equations carefully you will see that 2 things have changed between the 2. the "+c" is now "-c" and the "10" is now "3"

if we think about it you will see that c=7. well how do we know. when c or 7 was taken away from the problem it left you with 3

so that means a+b=3

we dont need to know what the exat value of a or b is.

so a+b +3c
(3) + 3(7)
3 + 21
24

a+b+3c=24

Explain how u would multiply 5x21/2