Use the grouping method to factor 2x^3+6x^2-7x-21

[x + 3][2x² - 7]

Step-by-step explanation:

Start out by doing this: [2x³ + 6x² ] - [7x - 21]

↑ ⤻ ↑

GCF: 2x² GCF: -7

Do as so: 2x²[x + 3] -7[x + 3]

You see, one factor is already found [x + 3]. You only use it ONCE. Now, the other factor comes from your two Greatest Common Factors from both groups [2x² - 7]. Together, you end up with the above answer. That arrow under the negative tells you that it is attached to the 3 [distribution of the negative].

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step-by-step explanation:

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