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Allushta [10]
3 years ago
13

Factor this polynomial completely. x2 - 81

Mathematics
2 answers:
vitfil [10]3 years ago
5 0
The first answer is right
Deffense [45]3 years ago
3 0
A is the correct answer!
81 is a negative, so the 9’s have to be a positive and a negative

hope this helps!
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Let f(x)=7x^2-8. find f(a^2)
strojnjashka [21]

Answer:

\large\boxed{f(a^2)=7a^4-8}

Step-by-step explanation:

f(x)=7x^2-8\\\\f(a^2)\to \text{put}\ x=a^2\ \text{to the equation of the function}\ f:\\\\f(a^2)=7(a^2)^2-8\qquad\text{use}\ (a^n)^m=a^{nm}\\\\f(a^2)=7a^{2\cdot2}-8\\\\f(a^2)=7a^4-8

6 0
3 years ago
Please I need help ASAP
artcher [175]
This is an exponential table
4 0
3 years ago
In a dog show, there will be a gold and silver medal awarded.There are 6 finalists. In how many ways can the 2 medals be awarded
Mandarinka [93]

Answer:

30

Step-by-step explanation:

Given: There are six finalists and two medals. That is it asks for the possibilities of 6 finalists taking two at a time. Say, for example the first and third finalist or the second and the sixth finalist and so on. The number of possibilities is given by $ ^nP_r $

                       $ ^nP_r = \frac{n!}{(n - r)!} $

So the number of possibilities of 6 finalists taken two at a time is $ ^6P_2 $

$ \implies \frac{6!}{(6 - 2)!} = \frac{6!}{4!}  \hspace{15mm} [n! = n \times (n-1) \times (n - 2) \times . . . 2 \times 1] $

$ \implies \frac{6 \times 5 \times 4 \times \times 3 \times 2 \times 1}{4 \times 3 \times 2 \times 1}  = 6 \times 5 = 30 $

4 0
4 years ago
Solve the equation
Elan Coil [88]

Answer:

A

Step-by-step explanation:

You would first subtract 6x from both sides which will give you something like:

-4= 2x - 9

then you would add 9 on both sides which would give you

5 = 2x

which now you would divide 2 by both sides with would give you

5/2 = x

simplify it one more time

2.5 = x

3 0
3 years ago
Read 2 more answers
A pencil and an eraser cost 1.10 together. if the pencil costs one dollar more than the eraser how much does the eraser cost
Kazeer [188]

1 pencil + 1 eraser = $1.10


Pencil cost $1 more than the eraser.

⇒ If we take away $1 from the total, both the pencil and the eraser will cost the same.

⇒ $1.10 - $1.00 = $0.10


Divide by 2 to find the cost of the eraser.

⇒$0.10 ÷ 2 = $0.05


Find the cost of the pencil, which is $1 more than the eraser.

⇒ $0.05 + $1 = $1.05


Answer: The eraser costs $0.05



8 0
3 years ago
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