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Andrews [41]
3 years ago
8

1. x² - 1 + y(y - 2x)​somebody plz help meeeeeeeeeeeeeeeeeeeeeee

Mathematics
2 answers:
Nostrana [21]3 years ago
5 0


Step1:Multiply each term in the parentheses by y.


Step2: calculate the product

lawyer [7]3 years ago
4 0

Answer:

{(x + y)}^{2}  - 1

Step-by-step explanation:

{x}^{2}  + y(y - 2x) - 1

{x}^{2}  +  {y}^{2}   - 2xy - 1

Using the identity (a - b)^2 here ,

{(x + y)}^{2}  - 1

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Solve this please .......​
nikdorinn [45]

Answer:

The sum of reciprocals is 2/3.

You don't need complex numbers to solve this, but if you try to find a and b you will need complex numbers.

Step-by-step explanation:

a+b = 2

a*b = 3

1/a + 1/b = x

(a*b)*(1/a + 1/b) = (a*b)x

b + a = (a*b)(x)

2 = 3x

x = 2/3

b = 2 - a

a*(2 - a) = 3

-a^2 + 2a = 3

-a^2 + 2a - 3 = 0

a^2 - 2a + 3 = 0

let's solve the quadratic equation

a^2 - 2a + 3 = a^2 - 2a + 1 + 2 = (a - 1)^2 + 2 = 0

(a - 1)^2 = -2

a_1 - 1 = \sqrt{2}i\\a_1 = 1+\sqrt{2}i\\\\a_2 - 1 = -\sqrt{2}i\\a_2 = 1 - \sqrt{2}i\\

these options correspond to a and b from the original question.

8 0
2 years ago
Ella stacks two boards under a table to make it level. One board is į inch thick. The
posledela

Step-by-step explanation:

the problem description is incomplete or wrongly copied.

we don't know the thickness of the boards, and we cannot understand what we need to calculate, and what the answer options are.

3 0
3 years ago
A water skier is towed 65 m to the south of the starting point, and then is turned 40° cast of south for another 35m. What is th
densk [106]

Using cosine law,

d^2 = 65^2 + 35^2 - 2(65)(35)cos140

= 8935.5022

d = sqrt(8935.5022)

= 94.5 m

Angle = inverseCos(35sin40 / 94.5) = 76.23 degrees South of East

7 0
1 year ago
Each of 5 gift bags contains X pencils.Tyler add 3 more pencil to each bag.together the gift pack contain 20 pencils.
noname [10]

Answer:

4.6

Step-by-step explanation:

5x +3 = 20

5x = 23

x = 4.6

5 0
3 years ago
Danielle needs to walk 2.5 miles. If she wants to reach her destination in 30 minutes (1/2hour), how fast does she need to walk?
miss Akunina [59]
She would need to walk .83 miles per minute
3 0
3 years ago
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