![]() ![]() Numbers are rational, and Sal's just picked out Now, you might say, OK,Īre these irrational? These are just these Really just pop out of nature, many of these It comes out of continuouslyĬomplex analysis. It goes on and on and onįorever, and it never repeats. The circumference to the diameter of a circle. Just a few of the most noteworthy examples. ![]() Numbers in all of mathematics are not rational. And it turns out- as youĬan imagine- that actually some of the most famous Wouldn't have taken the trouble of trying to Guessing that there are, otherwise people That are not rational? And you're probably Non-repeating decimals, and you've also included Over again, you can always represent that as Starts to repeat itself over and over and Repeating decimal, not just one digit repeating. Or maybe you've seen things likeĠ.6 repeating, which is 2/3. And we've seen-Īny repeating decimal as the ratio of two integers. Keeps going on and on forever, which we can denote by Maybe the most famous of the repeating decimals. I'm giving you multipleĮxamples of how this can be represented as Numerator and the denominator here by negative 2. 4 times 3 is 12, plus 3 isġ5, so you could write this. Or you could say, hey,ģ.75 is the same thing as 3 and 3/4- so let The ratio of two integers? Well, 3.75, youĬould rewrite that as 375/100, which is the That are not integers? For example, let us imagine. So negative 7 is definitelyĪ rational number. Represented as negative 7/1, or 7 over negative 1, or Have an infinite number of representations In all of these cases, these areĪll different representations of the number 1, 1 can be represented as 1/1 orĪs negative 2 over negative 2 or as 10,000/10,000. The ratio of two integers is a rational number. And the simple way to thinkĪbout it is any number that can be represented as The concept of infinity is very hard to grasp.Ībout rational numbers. That is not to say the the infinity of irrational numbers is larger than the infinity of rational numbers. The infinity of irrational numbers is more than the infinity of positive integers. See the Peter Collingridge comment below. There are some math concepts that do compare infinities. ![]() One infinite is not greater than, less than, or even equal to, another infinite. It is also not correct to say that the numbers between 0 and 1 and the numbers between 0 and 2 are the same. And you can't say that one infinite is more than another infinite, even though logically you might think there are twice as many numbers between 0 and 2 that there are between 0 and 1. Infinite is a concept of "going on forever" and is not something that can be added to to or multiplied. But "goes on forever" so you can't really say there are more numbers between 0 and 2 than between 0 and 1. ![]() It is a hard concept to completely comprehend.įor instance, there are an infinite number of decimals between 0 and 1.Īnd there are an infinite number of decimals between 0 and 2.Īnd there are numbers between 0 and 2 that are not between 0 and 1. So there are lots (an infinite number) of both.Īnd saying one thing that is infinite is more than another infinite thing is questionable because you can't add to infinite. And there is at least one irrational number between any two rational numbers. The values that make the equation true, the solutions, are found using the properties of real numbers and other results.Actually, Sal was saying that there are an infinite number of irrational numbers. The equation is not inherently true or false, but only a proposition. The expressions can be numerical or algebraic. In the following video we present more examples of how to evaluate an expression for a given value.Īn equation is a mathematical statement indicating that two expressions are equal. If the algebraic expression contains more than one variable, replace each variable with its assigned value and simplify the expression as before. Replace each variable in the expression with the given value, then simplify the resulting expression using the order of operations. To evaluate an algebraic expression means to determine the value of the expression for a given value of each variable in the expression. When that happens, the value of the algebraic expression changes. In each case, the exponent tells us how many factors of the base to use, whether the base consists of constants or variables.Īny variable in an algebraic expression may take on or be assigned different values. The numbers we use for counting, or enumerating items, are the natural numbers: 1, 2, 3, 4, 5, and so on. In this section we will explore sets of numbers, perform calculations with different kinds of numbers, and begin to learn about the use of numbers in algebraic expressions.
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