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vaieri [72.5K]
3 years ago
10

What are the factors of x2 − 81? (x + 9)(x − 9) (x − 9)(x − 9) (x + 3)(x − 27) Prime

Mathematics
2 answers:
Kaylis [27]3 years ago
6 0
X^2-81=x^2-9^2=(x+9)(x-9)

this is the answer 
stiv31 [10]3 years ago
3 0

Answer: The correct option is (A) (x+9)(x-9).

Step-by-step explanation:  We are given to select the factors of the following quadratic expression :

E=x^2-81~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(i)

We will be using the following factorization formula :

a^2-b^2=(a+b)(a-b).

From (i), we have

E\\\\=x^2-81\\\\=x^2-9^2\\\\=(x+9)(x-9).

Thus, the factored form of the given expression is (x+9)(x-9).

Option (A) is CORRECT.

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3 0
3 years ago
Someone help and plz make sure it’s right plz! :)
kvv77 [185]

Answer:

-21/4

Step-by-step explanation:

slope = y2-y1/ x2-x1

-18 - 3 / 17-13 = -21/4

4 0
3 years ago
Solve for the variable a D =a+b-c/3
yuradex [85]
Hey there,
solving for a is just like you think of all other letter as a constant
i.e the only variable is a
so you need to subtract b as a start
      d=a+b-c/3
-b             -b
=============

    -b+d=a-c/3                now it's time to add c/3 (isolate a by itself in one side)

     -b+d=a-c/3
+c/3         +c/3
==============
c/3-b+d=a

Hence you have solved for a




4 0
3 years ago
What is the solution to the system of equations? 2x+4t=12
katen-ka-za [31]

Answer:

C. (8, -1)

Step-by-step explanation:

{y = ¼x - 3}

{2x + 4y = 12

2x + 4[¼x - 3] = 12

2x + x - 12 = 12

3x - 12 = 12

+ 12 + 12

_________

3x = 24

__ __

3 3

x = 8 [Plug this back into both equations above to get the y-coordinate of −1]; -1 = y

I am joyous to assist you anytime.

6 0
3 years ago
What is the area of these trapezoid
Assoli18 [71]

Answer:

1. 54ft squared  2. 48 cm squared

Step-by-step explanation:

6 0
3 years ago
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