Week 12 PreCalc 11

This week we looked at solving absolute value equations. It’s the same as last chapter but with the absolute value signs it changes it so the entire graph is positive.

Example of a linear equation

If you replace y with 9 perhaps, then you can find the x values

ex

Then we can also do this with a quadratic equation:

Other than graphing it you can find the x values by solving if y was 6:

Week 11 PreCalc 11

This week we dived more into graphing by graphing quadratic inequalities in two variables. It’s basically the same thing as chp. 4 but we have to find out what side of the parabola the answers would come from. You do that by replacing x and y with numbers that aren’t on the line, (0,0) is the easiest so use that the most.

ex:

Week 10 PreCalc 11

Semingly I didn’t learn anything new this week, I did forget most about how to do sequences and series. But after studying I remembered how to find t_n or how to find S_n.

Example:

But the one thing I had troubles with was finding t_1 when i am givin t_4 and t_10 but after figuring it out I found it pretty easy because all you have to do is find out how many numbers are in between 4 and 10 and then the rest is easy.

Ex:

Week 9 PreCalc 11

This week in PreCalc 11 we learned how to take a word problem that looks like this, two number have a difference of 14, the product of those two numbers is the minimum, and we are able to find those two numbers.

We can do this taking a-b=14 and a*b=Minimum then isolating a in the subtraction equation the replacing a in the multiplication equation and then solve from there.

ex