Factor
7\left(3a^{2}-1\right)
Evaluate
21a^{2}-7
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7\left(3a^{2}-1\right)
Factor out 7. Polynomial 3a^{2}-1 is not factored since it does not have any rational roots.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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Matrix
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Limits
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