2 years ago

Prove x²+y² = (x+y) (x-y)

Mathematics

1 answer:

gtnhenbr [62]2 years ago

7 0

Answer:

(x+y)(x-y)

x^2 - xy + xy - y^2

x^2 - y^2

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7x+2y=-19 and -x+2y=21

Fittoniya [83]

Subtract the 2 equations

7x+2y=-19
- -x+2y = 21
--------------------------
8x +0y=-2

x= -1/4

7 0

3 years ago

The mass of the Earth is 5.972x10^24 kg. the mass of the moon is 7.3 x 10^22kg. find the total mass, in kg, of the Earth and the

torisob [31]

Answer:

6045000000000000000000000 kg.

Step-by-step explanation:

We have been given that the mass of Earth is $5.972\times10^{24}$ kg. The mass of the Moon is $7.3\times10^{22}$ kg.

To find the total mass we will add mass of Earth and Moon.

First of all let us convert the given masses in standard form.

$5.972\times10^{24}=5972000000000000000000000$

$7.3\times10^{22}=73000000000000000000000$

$5.972\times10^{24}+7.3\times10^{22}$

$5972000000000000000000000+73000000000000000000000$

$6045000000000000000000000$

Therefore, the mass of Earth and Moon is 6045000000000000000000000 kg.

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3 years ago

Kendra was given three gift certificates for her birthday, each worth 333 points, for a music service. In the past Kendra has do

Grace [21]

Each song downloaded costs 3 points

each video costs 40 points

total of 999 points

if each song cost 3 points and she has 999 points to use she can download 333 songs at max

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3 years ago

Read 2 more answers

Use the Pythagorean theorem to find the missing area

fgiga [73]

Answer:

28 cm^2

Step-by-step explanation:

a^+21^2=36^2

a^2+441=1225

a=28

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3 years ago

I don’t understand this. The number line question the first one.

Mama L [17]

Answer:

-2 + 5 = 3

Step-by-step explanation:

The arrow represents an addition, you start with -2 and add 5, so you end up at +3.

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3 years ago

Prove x²+y² = (x+y) (x-y)​

Prove x²+y² = (x+y) (x-y)