Question 4(Multiple Choice Worth 1 points) (07.04 LC) Factor completely 49x2 − 9. (7x + 3)(7x − 3) (7x + 3)(x − 3) (7x − 3)(7x −

Question

damaskus [11]

3 years ago

14

Question 4(Multiple Choice Worth 1 points) (07.04 LC) Factor completely 49x2 − 9. (7x + 3)(7x − 3) (7x + 3)(x − 3) (7x − 3)(7x −

3) (7x − 3)(x − 3)

Mathematics

2 answers:

lana66690 [7] · Answer 1 · 2022-01-24T23:45:40+03:00

lana66690 [7]3 years ago

8 0

Answer:

the answer to this is

(7x-3)(7x+3)

49x^2-21x+21x-9

49x^2-9

Step-by-step explanation:

scoundrel [369] · Answer 2 · 2022-01-24T22:01:16+03:00

Answer:

A

Step-by-step explanation:

We take a look at this expression: $49x^2-9$ and notice that both terms are square numbers. $49x^2=(7x)^2$ and $9=3^2$ .

There is a specific formula that I highly recommend you memorize involving differences of squares. It states that given the difference of squares $a^2-b^2$ , it can always be factored into $(a+b)(a-b)$ .

Here, we can apply that. In this case, a = 7x and b = 3. So:

$49x^2-9=(7x)^2-3^2=(7x+3)(7x-3)$

Thus, the answer is A.

Hope this helps!