Learn Before
Factoring
Factor completely by first extracting the GCF and then factoring the remaining trinomial whose leading coefficient is not 1.
Step 1 — Check for a GCF. The three terms , , and share a common factor of . Factor it out:
Be careful to keep this factor of 5 throughout the rest of the solution.
Step 2 — Factor the trinomial inside the parentheses. The expression is a trinomial with leading coefficient , so use trial and error or the ac method. The factored form is:
Step 3 — Check by multiplying all three factors:
✓
The completely factored form is . This example reinforces the importance of always checking for a GCF first — and of keeping the GCF factor throughout the entire solution. After extracting the GCF of 5, the remaining trinomial still has a leading coefficient of 2, requiring a method for with . Without factoring out the 5 first, the larger coefficients in would make the trinomial factoring much more difficult.
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Learn After
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