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
tangare [24]
2 years ago
9

If a+ b = 6 and ab = 2 find a^3 + b^3

Mathematics
1 answer:
irga5000 [103]2 years ago
5 0

Answer: 180

Step-by-step explanation:

This is just testing if you know the sum of cubes formula:

a^3 + b^3 = (a+b)(a^2 - ab + b^2) = (a+b)((a+b)^2 - 3ab)

Plugging in the respective values, you get

a^3 + b^3 = (6)(6^2 - 3(2)) = \boxed{180}

You might be interested in
A bag contains white matarles and red marables,126 in total.The number of whit marables is 6 more than 5 than 5 times the number
denis-greek [22]

Answer:106

Step-by-step explanation:

Let number of white marbles be w

Let number of red marbles be r

w+r = 126---------1

w = 6 +5r-----------2

Put eqn 2 in eqn 1

6+ 5r + r = 126

6 + 6r = 126

6r = 120

r = 20

w = 6 +5r =6+100

= 106

3 0
3 years ago
Match these similar triangles proof<br>​
AlekseyPX

Answer:

B

C

F

D

H

A

G

E

Step-by-step explanation:

Ok. They are trying to reconstruct the smaller looking triangle in the bigger triangle using angle A as the common angle.

The first statement is always the given.

Second they constructed line segment XY into the bigger triangle so that XY is parallel to BC.

Third, from the construction of the parallel lines we can now find corresponding angles that are congruent. This would be the use of F.

Since we have all three angles in triangle AXY and triangle ABC, then the construction of the smaller triangle we made inside the bigger triangle is similar to the bigger triangle. So we have the triangles are similar. You could say E or D here in my opinion. This is choice D.

Fifth the creation of those fractions of sides being equal comes from us knowing the corresponding sides of similar triangles are proportional. This is choice H.

Things looked cut off for the sixth thing so I can't fully read it, but it is possible a substitution has occured.

The seventh thing is a congruence statement which can be proven by a congruence postulate. The only one listed is SAS. So that is G.

The last thing, since the triangle construction is congruent to the smaller triangle then we know the smaller triangle is also similar to the bigger triangle since the bigger one is also similar to the construction we made. I really think E and D is interchangeable. Choice E goes here.

7 0
3 years ago
How do i express the number 7.901 x 10 to the power of 12
Cerrena [4.2K]

Answer:

7,901,000,000,000

Step-by-step explanation:

8 0
3 years ago
A square matrix A is said to be idempotent iff A2 = A. (i) Show that if A is idempotent, then so is I − A. (ii) Show that if A i
muminat

Answer:

Step-by-step explanation:

Given that A is a square matrix and A is idempotent

A^2 = A

Consider I-A

i) (I-A)^2 = (I-A).(I-A)\\= I^2 -2A.I+A^2\\= I-2A+A\\=I-A

It follows that I-A is also idempotent

ii) Consider the matrix 2A-I

(2A-I).(2A-I)=\\4A^2-4AI+I^2\\= 4A-4A+I\\=I

So it follows that 2A-I matrix is its own inverse.

7 0
3 years ago
The length of a rectangle is 4 more than its width. The area of the rectangle is 21m^2 . What is the measure of the width?
saw5 [17]
Make the length x+4 and the width x  and then make a formula x(x+4)=21
then u ll get x^2+4x-21=0  and then solve for x ..... the width is 3 

5 0
3 years ago
Other questions:
  • Will give brainliest to correct answer.
    9·2 answers
  • What is the length of AB
    9·2 answers
  • I need this answered ASAP please I beg of you. <br> I’m really confused on what to do here.
    6·1 answer
  • 2 less than one-third of the points that the Panthers scored
    11·1 answer
  • How to factor a2b2-1 or 144y2-49 can someome help me out on this please
    7·1 answer
  • Can someone answer this and explain how they got the answer? I am really confused.
    11·1 answer
  • 27+6+23+45+7^3+4+20^6
    14·1 answer
  • Help me do this please
    6·1 answer
  • Hey just doing this so you can get some points
    14·1 answer
  • Tim just took a job working for a software company. His contract states he will receive an annual salary of $61,500 and be paid
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!