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Example

Factoring 4x+124x + 12

Factor 4x+124x + 12 by extracting the greatest common factor.

Step 1 — Find the GCF of 4x4x and 1212: Factor each term into primes: 4x=2⋅2⋅x4x = 2 \cdot 2 \cdot x and 12=2⋅2⋅312 = 2 \cdot 2 \cdot 3. The common factors are two 22s, so GCF=2⋅2=4\text{GCF} = 2 \cdot 2 = 4.

Step 2 — Rewrite each term as a product of the GCF: Express 4x=4⋅x4x = 4 \cdot x and 12=4⋅312 = 4 \cdot 3, giving 4⋅x+4⋅34 \cdot x + 4 \cdot 3.

Step 3 — Apply the reverse Distributive Property: Factor out the 44: 4(x+3)4(x + 3).

Step 4 — Check by multiplying: 4(x+3)=4⋅x+4⋅3=4x+124(x + 3) = 4 \cdot x + 4 \cdot 3 = 4x + 12 ✓.

The factored form is 4(x+3)4(x + 3).

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Updated 2026-04-21

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