Algebra-1

Question Analysis
This question tests the ability to factor a multivariable polynomial using the grouping method, which is a key skill in Algebra-1.

Key Concept Explanation
Factoring multivariable polynomials involves identifying common factors and grouping terms to simplify the polynomial.

Step-by-step Solution
Step 1: Factor out the GCF of all terms first
All terms share a common factor of 7y.
Factor this out first:
Step 2: Group the remaining polynomial into two pairs
Group the terms inside the parentheses:
Step 3: Factor out the GCF from each group
From the first group , the GCF is :