Question

Please Help!

Factor completely 3x2 − 21.
3(x2 − 7)
3(x + 7)(x − 7)
3(x + 7)(x − 3)
Prime

Answer 1

The fully factored form is 3(x^2 - 7))

Explanation:

The only thing you can do with this equation is take out a factor of 3. You cannot simplify the resulting parenthesis without using irrational numbers.

Answer 2

Answer: The correct option is (A)
`3(x^2-7).`

Step-by-step explanation: We are given to factorize the following quadratic expression completely :

`P(x)=3x^2-21.`

To factorize the given expression, first we should take common terms out and then we will continue the process.

The factorization is as follows :

`P(x)\\\\=3x^2-21\\\\=3(x^2-7).`

Thus, the required factorized form is
`3(x^2-7).`

Option (A) is correct.