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math: use faster interval line

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eggy 2020-10-29 15:12:59 -04:00
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commit 1af14fe98c
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docs/mhf4u7.md
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@ -516,7 +516,7 @@ To identify the positive or negative regions of an equation, an interval line or
1. Factor the equation as much as possible and identify the x-intercepts.
2. Place the x-intercepts on a line.
3. Solve for any value in between two x-intercepts. That region is the sign of the solved value.
3. Find the sign of the end behaviour by taking the sign of the leading coefficient.
4. When crossing an x-intercept, if the degree of that factor is even, the sign stays the same; otherwise, it alternates.
5. Repeat for every other region.