1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
yarga [219]
3 years ago
9

The real numbers $x$ and $y$ are such that \begin{align*} x + y &= 4, \\ x^2 + y^2 &= 22, \\ x^4 &= y^4 - 176 \sqrt{

7}. \end{align*}Compute $x - y.$
Mathematics
2 answers:
stepan [7]3 years ago
5 0

Answer:

-2sqrt(7)

Step-by-step explanation:

Solution:

From the third equation, $x^4 - y^4 = -176 \sqrt{7}.$

By difference of squares, we can write

\[x^4 - y^4 = (x^2 + y^2)(x^2 - y^2) = (x^2 + y^2)(x + y)(x - y).\]Then $-176 \sqrt{7} = (22)(4)(x - y),$ so $x - y = \boxed{-2 \sqrt{7}}.$

tamaranim1 [39]3 years ago
4 0

You get everything you need from factoring the last expression:

x^4-y^4=-176\sqrt7

The left side is a difference of squares, and we get another difference of squares upon factoring. We end up with

x^4-y^4=(x^2-y^2)(x^2+y^2)=(x-y)(x+y)(x^2+y^2)

Plug in everything you know and solve for x-y:

-176\sqrt7=(x-y)\cdot4\cdot22\implies x-y=\boxed{-2\sqrt7}

You might be interested in
Olivia planted 25 tomato plants, but only produced 20 tomatoes. What percentage of plants produce tomatoes?
solmaris [256]

Answer:

It would be 5.

Step-by-step explanation:

Hope this help!

8 0
3 years ago
A naval engineer uses the function, P, to analyze the effects of water pressure on submarines. The function P(d) measures the pr
saw5 [17]

The function that the naval engineer uses related P (pressure) and d (depth of ocean).

<em>Is there any restriction on the domain ( d: depth of the ocean)? Yes!</em>

The domain would be from 0 (at sea level or 0 depth) until the depth of the ocean (which is not infinite). Hence, we can write:

0\leq d\leq DepthOfSeaFloor

Choice D is the correct one.


ANSWER: D

5 0
3 years ago
Read 2 more answers
Look at the equation below. Identify which equation has no solution
IgorC [24]

Answer:

C

Step-by-step explanation:

24a-22  = -4(1-6a)\\\\\implies 24a-22  = -4+24a\\\\\implies -22 = -4\\\\\text{Which is not true, so no solutions exist.}

4 0
2 years ago
The ardered.pairs.(0, 1), (3, 10) and (4, n) are solutions of the same linear equation. Find n.
Fittoniya [83]

Answer:

n = 13.

Step-by-step explanation:

Slope of the line = (10-1)/3-0) = 3

So the equation of the line is:

y - 1 = 3(x - 0)

y = 3x + 1

When x = 4 y = n,  so:

n = 3(4) + 1 = 13.

n = 13.

7 0
2 years ago
Please answer this quickly ​
PtichkaEL [24]

Answer:

26.85in

Step-by-step explanation

7 plus 7 plus plus 5 equals 19 plus the semi circle of 7.85

4 0
3 years ago
Read 2 more answers
Other questions:
  • Carlos is arranging books on shelves. He has 32 novels and 24 autobiographies. Each shelf will have the same numbers of novels a
    15·2 answers
  • A geological study indicates that an exploratory oil well drilled in a certain region should strike oil with probability 0.1. As
    5·1 answer
  • Ayo everyone what u getting for christmas
    6·1 answer
  • Please explain. This is for me and a friend too. NO LINKS OR I WILL REPORT YOU!!
    9·2 answers
  • M(4, 2) is the midpoint of RS. The coordinate of S are (6, 1). What are the coordinates of R?
    12·1 answer
  • The slope of a given line is shown below. Find the slope of a line parallel to the given line and the slope of a line perpendicu
    14·1 answer
  • The following are the temperatures in °C for the first 8 days of January: -4.5, -1.5, 2, 3, -5, -2, -0.5, 2.5 What is the median
    6·1 answer
  • Which of the following graphs the equation. <br> Y=1/3x -2
    8·1 answer
  • Points a and b both lie on the line y=3x+7. Work out the missing y coordinate for a and the missing x coordinate for B?
    5·1 answer
  • Find the value of d.<br> 1/2d - 5 -1/4d = 10
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!