Chapter 0: Problem 12
Give an example of two irrational numbers whose product is an irrational number.
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Chapter 0: Problem 12
Give an example of two irrational numbers whose product is an irrational number.
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The first letters of the phrase "Please excuse my dear Aunt Sally" are used by some people to remember the order of operations: parentheses, exponentiation (which we will discuss in a later chapter), multiplication, division, addition, subtraction. Make up a catchy phrase that serves the same purpose but with exponentiation excluded.
Show that $$ || a|-| b|| \leq|a-b| $$ for all real numbers \(a\) and \(b\).
The intersection of two sets of numbers consists of all numbers that are in both sets. If \(A\) and \(B\) are sets, then their intersection is denoted by \(A \cap B .\) In Exercises \(31-40,\) write each intersection as a single interval. $$ (-\infty, 4) \cap(-2,6] $$
In Exercises \(19-30,\) write each set as an interval or as a union of two intervals. $$ \\{x:|x+6| \geq 2\\} $$
In Exercises 1-6, find all numbers \(x\) satisfying the given equation. $$ |x+1|+|x-2|=7 $$
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