Question

Rewrite 7a + 21ab using a common factor.

1. 7a(1 + 3b)
2. 7a(0 + 3b)
3. 7ab(0 + 3)
4. 7ab(1 + 21ab)

Answer 1

Explanation:

The correct answer is:

1. 7a(1 + 3b)

You can factor out 7a from both terms to get this expression.