Question

Sorry! I suck at factors.
Factor Completely: 3x2 − 21

3(x2 − 7)

3(x + 7)(x − 7)

3(x + 7)(x − 3)

Prime

Answer 1

How can we rewrite 21 as the product of two numers?

Answer 2

Hint:

\(3x^2 - 3 \dot\ 7\)

Answer 3

Is it the third one?

Answer 4

3x^2 - 21 is 3(x^2 - 7), but 3(x+7)(x-7) would give you 3(x^2 - 49), not 3(x^2 - 7). So the answer is the first choice.

Answer 5

@best.shakir
Be careful, -3*5=-15

Answer 6

sorry

Answer 7

i thought the question is *tion