Month: April 2019

This week we learned about graphing inequalities in two variables. It’s similar to how we did it in chapter 4, but we must find out what side of the parabola is used for the answers of the side by replacing x and y with numbers that aren’t on the line, (0,0) is the easiest to use in most cases so we usually use that to replace x and y.

In this example I show how to use this technique by replacing x and y with (0,0)

We focused on studying for our midterm this week. To prepare for it, I spent my time rewriting most of my notes as to remember what we learned and how to do everything along with going over the reviews and practice tests in the textbook of each unit and doing the cumulative review. Doing this will help my mind refresh on all that I’ve learned throughout the semester along with questions that may be on the test as the reviews have the main ideas of each unit in them which are usually shown in the tests. Hopefully, this studying will aid me in getting a good mark on the midterm.

This week we learned how to do word problems with quadratic functions, like finding the maximum area of a certain amount of fencing or finding two integers with a sum or difference that have a minimum or maximum and find the answer to the maximum area or finding the two integers.

An example of how to find the integers is by taking, for example, x-y=15 and x*y=minimum and isolating one of the variables and using the substitution technique of turning it into x=y+16 and then replacing x in the multiplication with y+16 and solving before using the difference of squares to turn it into a quadratic and get an answer

Ex

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This week in pre-calc we learned how to analyzing quadratic functions in the form of graphs using the equation

The vertex is found easily with this as the p variable is what ends up being the x value and the q variable being the y value in the vertex.

With the vertex we can then find the axis of symmetry.

With the coefficient of x (a being the variable of whatever the coefficient is) we can figure out if its maximum or minimum vertex if it’s negative or positive, if minimum it opens upward and if maximum it opens downwards. Using the information of the equation we can figure out what its congruent to as well as the rest of the information needed such as x/y intercepts and domain and range