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Mathematics 15 Online
OpenStudy (anonymous):

Can someone tell me how I should go about this problem?

OpenStudy (anonymous):

Part A: Write an algebraic expression for 8 more than 5 times a number. Part B: What is another way this expression can be read?

OpenStudy (mathstudent55):

Start by choosing a variable to represent the number. Which letter do you like as a variable, x, n, a, b, ...? It's your choice.

OpenStudy (anonymous):

x

OpenStudy (anonymous):

i believe its x/5?

OpenStudy (mathstudent55):

Great. We'll use x. How do you show 5 times a number if the number is x?

OpenStudy (mathstudent55):

No. x/5 means x divided by 5. Remember that a fraction means division. We want to show 5 times x, not x divided by 5.

OpenStudy (anonymous):

wait no sorry 5*x

OpenStudy (anonymous):

or 5 ⋅ x

OpenStudy (mathstudent55):

Correct, but in math, we are lazy, so we want to write as little as possible, so we normally shorten 5 * x to simply 5x.

OpenStudy (mathstudent55):

5x means 5 times the number represented by the variable x, or simply, 5 times a number. Now we have another step. We need to show 8 more than 5x.

OpenStudy (mathstudent55):

For example, 8 more than 2 is 10, and 8 more than 10 is 18. What operation do you do with 8 and 2 to end up with 10? What operation do you do with 8 and 10 to end up with 18?

OpenStudy (anonymous):

Add

OpenStudy (mathstudent55):

Exactly. To show a number is 8 more than another number, you add 8 to the number. Here we need to add 8 to 5x. We end up with 5x + 8

OpenStudy (mathstudent55):

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