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### Course: Algebra 1>Unit 9

Lesson 1: Introduction to arithmetic sequences

# Extending arithmetic sequences

Sal extends the arithmetic sequences -8, -14, -20, -26,... and 2, -1, -4, -7, -10,... to find their next terms.

## Want to join the conversation?

• I always assume things I learn hear will help me on the exam. Then I got to the exam or compare notes to what the professor is teaching in the class and they are totally different. These examples are very simplified and lacking in depth. Why is this?
• They only teach you the basics and the formula, as for the harder problems, you just have to plug in the formula and think about it.
• Why do questions that look hard end of easy once when you know them?
• Because your brain has learned them! once you have learned them its actually easy, I think its because you know what symbols like ^ and letters in math mean. for example

K = 4
2^5*4(25 +3)+k12*1^99

2^5 means 2 to the fifth power, which is 32. 32*4(25 +3) means 32 times (4*28). 4*28 = 112, 32 * 112 = 3584. k12 means k times 12 which means 4 times 12, which is 48. 1^99 means 1 to the 99th power, which is 1, as 1*1 will always equal 1. meaning the final result of the problem is 3584 + 48 = 3632.
(1 vote)
• Which grade that will learn this lesson?
• This is in the Algebra 1 section, so I'll say it's in 9th grade.
• what job will this be needed for?
• This helps make other math clearer in the future. That's what math is for. Without arithmetic you couldn't understand Algebra. Without understanding simplification of equations you couldn't easily understand simplification of inequalities. Etc. Etc.
Hope this helps!
• why is it the more u practice the easier it becomes over time?
• 'Cause practice makes perfect! It just gets the idea closer and closer to your mind until it's locked in there!😁
• For me it was the other way around.
• What website did he used for practices?
• It is KhanAcademy in its original format.
• Best way that I see, is to consider things in terms of moving on number line