Class 10 (Old)
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?(0 votes)
- 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.(8 votes)
- Which grade that will learn this lesson?(5 votes)
- what job will this be needed for?(3 votes)
- 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!(4 votes)
- why is it the more u practice the easier it becomes over time?(3 votes)
- 'Cause practice makes perfect! It just gets the idea closer and closer to your mind until it's locked in there!😁(3 votes)
- What website did he used for practices?(2 votes)
- When do you have to find the formula for the sequence to find the next few numbers to the sequence or is it superfluous to find the formula?(1 vote)
- When you only need to find the next few terms, you really can do without the formula, but if you are trying to find the 24th or 36th term, you do not want to write the whole sequence, you want to find an equation and plug the number in. So you have to decide when it becomes easier to find and use an equation as opposed to writing terms.(2 votes)
- [Voiceover] We're told the first four terms of an arithmetic sequence are given. So it goes from negative eight to negative 14 to negative 20 to negative 26. What is the fifth term in the sequence? So we just need to figure out the next term. Well, in arithmetic sequence, each successive term is separated by the same amount. So when we go from negative eight to negative 14, we went down by six and then we go down by six again to go to negative 20 and then we go down by six again to go to negative 26, and so we're gonna go down by six again to get to negative 32. Negative 32. Let's do a couple more of these. The first five terms of the sequence are given. What is the sixth term? Let's see, to go from two to negative one, you subtracted three. Two minus three is negative one. Negative one minus three is negative four. Negative four minus three is negative seven. Negative seven minus three is negative 10. And so negative 10 minus three is negative 13. So hopefully that gives you the hang of things.