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
Taya2010 [7]
3 years ago
7

Which of the following is a perfect square trinomial?

Mathematics
1 answer:
shutvik [7]3 years ago
5 0

Answer:

A.

Step-by-step explanation:

Take a look at what happens when squaring either of these...

(ax-by)^2=(ax-by)(ax-by)=a^2x^2-2abxy+b^2y^2\\\\(ax+by)^2=(ax+by)(ax+by)=a^2x^2+2abxy+b^2y^2\\

Notice a couple of patterns.

1.  The last term has a positive coefficient.  That rules out answer choices C and D.

2.  The coefficient of the middle term is either +2ab \text{ or } -2ab .  So what are <em>a</em>  and <em>b</em>?  <em>a</em> is the square root of the x^2 term and <em>b</em> is the square root of the y^2 term.

25x^2 \Rightarrow a=5\\\\9y^2 \Rightarrow b=3\\\\ab=15\\\\2ab=30

The middle coefficient needs to be either +30 or -30.  The answer is choice A.

You might be interested in
What is 6 thousandths of a meter of a decimal
Svetllana [295]
0.006
That's you're answer
5 0
3 years ago
Read 2 more answers
Anyone I need help with this problem plss
Nady [450]

Answer:

About 1.23 standard deviation above the mean

Step-by-step explanation:

From what we have here, we need to calculate the difference between the given value and the mean and divide by the standard deviation

That would be through calculating the z score as follows;

z-score = (x - mean)/SD

where x is the given value

z-score = (87-71)/13 = 1.23

Since the score is bigger than the mean, the correct choice here is that the score is about 1.23 standard deviation above the mean

3 0
3 years ago
Elle went to pet smart and bought 4 gold fish and three turtles for $28. later the day, warren went to Petsmart and bought six g
AlekseyPX
It would cost 40$ because you are doing 10 times 4
8 0
3 years ago
Read 2 more answers
* ANSWER PLS * What is the value of x?
uysha [10]

Answer: 21°

Step-by-step explanation:

Since angles DAE and CBE are inscribed on arc AC, they r equal

Hence angle CBE = 42°

So angle DAE = 42/2 = 21°

8 0
3 years ago
What is the average rate of change from x = −3 to x = −4?<br> The parabola is open upward
Vilka [71]
The rate of change is +(-1) or -1
3 0
3 years ago
Other questions:
  • After one hour in flight, an airplane is located 100 miles north and 200 miles west of the airport. What is the velocity of the
    15·1 answer
  • Tacoma's population in 2000 was about 200 thousand, and has been growing by about 8% each year. If this continues, what will Tac
    14·1 answer
  • A'mari has finished 60% of an art project
    8·1 answer
  • Perform the indicated operation. y^2 + 3y-10/3y+15 divided (10-5y)
    9·1 answer
  • The volume of a square prism with height of 21 inches and each side of the base s inches is given by the expression 7s2. Find th
    8·1 answer
  • Let f(x) = 3x + 6 and g(x) = 2x^2. Perform the function operation and then find the domain of the result.
    11·1 answer
  • What is the difference between the absolute value of 4 and the absolute value of –3?
    10·2 answers
  • PLEASE HELP I WILL MARK YOU BRAINLIEST. FIND THE AREA
    9·1 answer
  • Seven less than twice a number w is 15.What is the number?​
    9·2 answers
  • Evaluate 2 to the ninth power. Help plz
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!