# Factoring and Trinomials

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What is factoring by group?

When do you factor a trinominal and why is it necessary to write the trinominal in four terms?

Please show examples.

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##### Solution Summary

The solution explains how and when to use factoring by grouping.

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Algebra

Factoring by grouping is when you

1) Group the first two terms together and then the last two terms together.

2) Factor out a greatest common factor (GCF) from each separate binomial.

3) Factor out the common binomial.

This doesn't work for all expressions, but it's worth trying in some cases.

Trinomials are polynomials that have three terms (like x2 + x + 1). ...

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