Question

Factor Completely: 3x2 − 21

Answer 1

factor out the 3
then use difference of squares

Answer 2

\[x^2-y^2=(x+y)(x-y)\]

Answer 3

3(x-7)(x+7)

Answer 4

3(x^2 - 7) = 3(x-sqrt7)(x+sqrt7)

Answer 5

i meant sqrt

Answer 6

3(x-sqrt7)(x+sqrt7) this is what i meant

Answer 7

actually the answer could just be
3(x^2 -7)
if they want all integers