Question

What number fills in the blank to complete the factorization of 3x + 24? (x + 8)

Answer 1

we have

$3x+24$

Find the greatest common factor GCF

we know that

$3\\ Factors=1,3\\ \\ 24=2^{3}*3\\ Factors=1,2,3,4,6,8,12,24$

so

The GCF is equal to $3$

therefore

$3x+24=3*(x+8)$

the answer is

The number is $3$

Answer 2

There should be a 3 before the bracket