How to factor 7m^4 - 112n^4 completely
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How to factor 7m^4 - 112n^4 completely

[From: ] [author: ] [Date: 11-12-16] [Hit: ]
......
When I try to do the problem the farthest I get is 7(m^4-16n^4). Please help?

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m^4 - 16n^4 is the difference of 2 squares

7 * (m^4 - 16n^4) =>
7 * (m^2 - 4n^2) * (m^2 + 4n^2) =>
7 * (m^2 + 4n^2) * (m - 2n) * (m + 2n)

There you go.

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7 (m - 2 n) (m + 2 n) (m^2 + 4 n^2)
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