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
mars1129 [50]
3 years ago
5

Step by step Please urgent

Mathematics
1 answer:
kotegsom [21]3 years ago
6 0

Answer:

Below in bold.

Step-by-step explanation:

1) ( a^2 + b^2 = (a + b)^2 - 2ab

= 29 - 2(6)

= 29-12

= 17.

2).  (x - y)^2 = x^2 + y^2 - 2xy

so 20 = 18 - 2xy

2xy = 18-20 = -2

xy = -1.

3). 1/x + x = 7

(1/ x + x)^2 = 1/x^2  + x^2 +x/x + x/x

= 1/x^2 + x^2 + 2

But(1/x + x)^2 = 7^2 = 49

so 1/x^2 + x^2 + 2 = 49

so 1/x^2 + x^2 = 49 - 2 = 47.

You might be interested in
Find the missing length
bonufazy [111]
Apply the Pyth. Theorem:

c^2 = 3^2 + 7^2, or     c^2 = 9 + 49  =  58.  Thus, c = sqrt(58).
7 0
3 years ago
Quando existe, dizemos que a solução de um sistema de equações lineares é o conjunto ordenado de números que satisfaz todas as e
QveST [7]
X representa o numero das suas respostas certas.
y represnta o numero das suas respostas erradas.
O total de perguntas <span>é 25, portanto
x + y = 25

Agora tratamos do dinheiro.
Come</span>ça com <span>R$ 500,00
Pelas x respostas certas, recebe 200x.
Pelas y respostas errads perde 150y.
O total de dineheiro inicial mais os ganhos menos as perdas s</span>ão iguais a
R$ 600,00, portanto
500 + 200x - 150y = 600
200x - 150y = 100
20x - 15y = 10

Temos um sistema de duas equações com duas variaveis.

<span>x + y = 25</span>
20x - 15y = 10

      15x + 15y = 375
+    20x - 15y = 10
---------------------------
       35x         = 385
           x         = 11

x + y = 25

11 + y = 25

y = 14

Resposta: Errou 14 perguntas.


5 0
3 years ago
3x^2 -5x -2=0
Kipish [7]

Answer:

Step-by-step explanation:

1. Find two numbers that add to make the coefficient of x (in this case, -5) and that multiply to make the constant term multiplied by the coefficient of x^2 (in this case, -2 x 3 = -6)

Two numbers that work are -6 and +1

-6 x +1 = -6

-6 + -1 = -5

2. Split the middle term into the two numbers that you found.

3x^2 -6x +x -2 = 0

I've put the -6 on the left side because in our next step, when we factorise, it will be easier than having the numbers the other way around.

3. Factorise the left side by taking out common factors from each pair. The pairs I'm talking about here are '3x^2 and -6x', and 'x and -2'

3x (x-2) +1 (x-2) = 0

4. You now have two numbers both being multiplied by the term x-2. We can rearrange this equation to give us two brackets being multiplied by each other.

(3x + 1) (x-2) = 0

5. According to the Null Factor Law, if two terms are multiplied together and the result is 0, then one of those terms must be 0. Make both terms equal to 0 and solve each for x.

3x + 1 = 0              x-2 = 0

3x = -1                   x = 2

x = -1/3

6. The solutions to this equation are x = 2 and x = -1/3

6 0
3 years ago
Read 2 more answers
Please help me idk what it's even asking for​
AveGali [126]

Answer:

It is asking you what you would put as your statement for step 4.

Step-by-step explanation:

The answer by the way would be what you have clicked on - angle 1 + angle 4 = 180 degrees.

4 0
3 years ago
Read 2 more answers
If a female is 5ft even has 8 oz of 80 proof liquor over hours, will it be out of her system and blood a 000 on a breathalyzer 1
den301095 [7]

Answer:No

Step-by-step explanation:

No

4 0
3 years ago
Other questions:
  • camper attaches a rope to the top of her tent to give it more support. She stakes the rope, which is 8 ft long, to the ground at
    12·2 answers
  • Four pounds of apples cost $1.56. What is the unit cost?
    8·1 answer
  • A(r) is a function that gives the area of a circle with radius r. It can be written in equation form as A(r)=3.14r2. What is the
    10·1 answer
  • Two angles that are directly across from each other when two lines intersect. supplementary angles complementary angles adjacent
    6·2 answers
  • Which equation is the inverse of y = 100 – x2?
    11·1 answer
  • Given the two points (3, -1) and (5,3), explain how to write the equation of the line in slope intercept form.
    15·2 answers
  • Please Solve this. Last Question of the Day So Points Increase a little bit. :)
    5·2 answers
  • What is 6.5% of $6991.94
    8·2 answers
  • Select the statement(s) that describe the plane(s) of symmetry for the solid. Select all that apply.
    8·1 answer
  • Need help with math problem if do get 5 star
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!