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
Leokris [45]
3 years ago
7

When asked to factor the x^2-121 a student gives the answer (x-11)(x-11) what is wron with this answer?

Mathematics
2 answers:
Art [367]3 years ago
7 0

Given expression is x² - 121

This is called Difference of Squared terms, we have a formula that is given as :-

a² - b² = (a - b) · (a + b)

Now using the above formula in the given expression, we get :-

x² - 121

x² - (11)²

here a = x and b = 11

x² - (11)² = (x - 11) · (x + 11)

but it says that student gave the answer as (x - 11) · (x - 11).

So, student's answer should be (x - 11) · (x + 11) instead of product of two (x - 11) terms.

Akimi4 [234]3 years ago
3 0

Answer:

one minus sign should be a plus sign

Step-by-step explanation:

You might be interested in
A bag of rice has a mass of 3.18 pounds. Find its mass in kilograms
Paha777 [63]
1 pound = 0.453592 Kilograms
Mass of the rice in pounds = 3.18 pounds
3.18 pounds = (3.18*0.453592) Kilograms
                     = 1.442424 Kilograms
The mass of the rice in kilograms is 1.442424 Kilograms.
7 0
3 years ago
Kwamee created a coffee blend for his cafe by mixing Kona beans and Fuji beans. Kona beans cost $11 per pound and Fuji beans cos
yKpoI14uk [10]
Let's use K for Kona and F for Fuji. The system of equations has to be a balanced system. For example, you can't mix the number of pounds of beans with the cost for each because pounds and dollars are different and you can only combine like terms...pounds with pounds and dollars with dollars. So let's start with the number of pounds. Since we don't know how much of each he bought we have the 2 unknowns, F and K, but we DO know that he bought 23 pounds total. So the first equation is
K + F = 23
Now let's see what we can do with the dollars. Again, we don't know how much he bought of each kind of coffee, but we do know that Kona beans cost $11 per pound and that Fuji beans cost $7.50 per pound, and we know that he spent a total of $197. So let's set that up:
11K + 7.50F = 197
Those are your 2 equations. It doesn't say you need to solve them, so you're done.
7 0
2 years ago
If (x + 2 ) is a factor of x3 − 6x2 + kx + 10, k =
BartSMP [9]
If a binomial x-a is a factor of a polynomial p(x), then p(a)=0.

x+2 is a factor of p(x)=x³-6x²+kx+10, so p(-2)=0.

p(-2)=0 \\
(-2)^3 - 6 \times (-2)^2 + k \times (-2) + 10=0 \\
-8-6 \times 4-2k+10=0 \\
-8-24-2k+10=0 \\
-2k-22=0 \\
-2k=22 \\
k=\frac{22}{-2} \\
\boxed{k=-11}
8 0
3 years ago
Read 2 more answers
Calculate the mean of the following. 3,5,6,4,7,3,9,8​
madam [21]

Step-by-step explanation:

mean = sum of observation/ no. of observation

mean = 3+5+6+4+7+3+9+8/ 8

<h2>mean = 45/8 = 5.6</h2>
5 0
3 years ago
Read 2 more answers
Y
AVprozaik [17]

Answer:

The coordinates of point R are (7,6), second option

Step-by-step explanation:

Coordinates of point R:

The coordinates of point R are , so (6,-7).

90° counterclockwise rule:

The rule for a rotation of 90º counterclockwise is given by:

(x,y) -> (-y,x)

What are the coordinates of point R?

(6,-7) -> (-(-7),6) = (7,6).

The coordinates of point R are (7,6), second option

6 0
2 years ago
Other questions:
  • The measure of an angle is 8 degrees less than three times the measure of another angle. If the two angles are supplementary, wh
    14·1 answer
  • A brand name has a a 40 40​% recognition rate. Assume the owner of the brand wants to verify that rate by beginning with a small
    12·1 answer
  • What is the domain of the function in this table?
    12·1 answer
  • Isabella worked 50 hours over the past two weeks, and she gets paid by the hour. During the first week of the two-week span, she
    13·2 answers
  • Can you please help me.Have a good day :)
    7·2 answers
  • A card is drawn at random from a standard deck of cards. What is the probability that the card is black or a face card
    10·2 answers
  • Someone help me please i have 20 minutes left to finish this
    10·1 answer
  • A cone has a diameter of 12 centimeters and a height of 9 centimeters. Using 3.14 for pi, find the
    7·1 answer
  • Which is the best first step when solving the following system of equations?
    14·2 answers
  • Put the following equation of a line into slope-intercept form, simplifying all fractions. 4y-4x= -28
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!