From b0328e8023204534ee719d703b2f859b92b35f6c Mon Sep 17 00:00:00 2001 From: zleyyij Date: Wed, 17 Jan 2024 10:19:33 -0700 Subject: [PATCH] vault backup: 2024-01-17 10:19:33 --- .obsidian/plugins/obsidian-git/data.json | 2 +- education/math/Rational Inequalities.md | 8 ++++++-- 2 files changed, 7 insertions(+), 3 deletions(-) diff --git a/.obsidian/plugins/obsidian-git/data.json b/.obsidian/plugins/obsidian-git/data.json index 7b1247f..4bc189e 100644 --- a/.obsidian/plugins/obsidian-git/data.json +++ b/.obsidian/plugins/obsidian-git/data.json @@ -2,7 +2,7 @@ "commitMessage": "vault backup: {{date}}", "autoCommitMessage": "vault backup: {{date}}", "commitDateFormat": "YYYY-MM-DD HH:mm:ss", - "autoSaveInterval": 1, + "autoSaveInterval": 5, "autoPushInterval": 0, "autoPullInterval": 5, "autoPullOnBoot": false, diff --git a/education/math/Rational Inequalities.md b/education/math/Rational Inequalities.md index 9aff75f..235d24d 100644 --- a/education/math/Rational Inequalities.md +++ b/education/math/Rational Inequalities.md @@ -2,7 +2,11 @@ $$ \frac{x+3}{x-4} < 0 $$ 1. Draw a number line. -2. Look at the bottom of the fraction $x - 4$, solve for x($x = 4$ ). When the bottom equals zero, put an empty circle on the line to mark a hole, because you cannot divide by 0. +2. Look at the bottom of the fraction $x - 4$, solve for x($x = 4$ ). When the bottom equals zero, put an empty circle on the line to mark an empty point, because you cannot divide by 0. 3. Look at the top, solve for zero, and put another point on the line. If it's $\le 0$, this point is filled in, otherwise it's another hole. Now check each "section" along the line by plugging in an arbitrary value to see if the result evaluates to less than zero. -$$ \frac{(x+1)^2}() \ No newline at end of file +$$ \frac{(x+1)^2(x-1)}{(x+4)(x-3)} \le 0 $$ +In this case, solving the bottom means that you'll have empty points on $x - 4$ and $x - 3$. Solving the top means that you'll have filled in points at $x = -1$ and $x = 1$. At this point the number line will be divided into chunks. You can pick an arbitrary number in each chunk and plug it in for $x$. This will let you figure out which parts of the range are valid. The result is written in the form of $(m, M) \cup (m, M)$. + +If the other side isn't zero (EG, $< 3$), you'll move everything to one side. You can do this by multiplying the right side by the denominator on the bottom of the fraction +$$ \frac{2x-17}{x-5} \ No newline at end of file