# Precalculus 11 week 14

This week we learned how to Multiply and divide rational expressions.

First factor the top and bottom of each fraction. then look and see if there are adding or subtracting between the expressions because they hold each expression together so that they can’t cancel out. Now, find the numbers that your variable can’t equal these are your non-permissible values. Then cancel out your pairs of expressions. You now have a finished answer.

eg.  # Precalculus 11 week 13

Graphing absolute value quadratics. When graphing an absolute value quadratic’s you basically reflect whatever is below the x axis.

example

Original Y = -x^2+5 is red

Absolute Y = l-x^2+5l is blue If the whole parabola is below the x axis this is what it looks like.

Original Y = -x^2-3 is green

absolute Y = l-x^2-3lis blue # Precaculus 11 Week 10

This week was mostly tests and studying but we also learned how to plot quadratic iniquities an a number line / x axis.

First review the basics. Now an example including solution. Plot on line. Insert answer into original question to find out if the circle is open or closed. Then we know our answer is correct and we know the circle is open.

# Precalculus 11 week 6

This week what stood out to me was finding out how to identify perfect square trinomials. below is an example of a perfect square trinomial. $x^2+8x+16$

To make sure it is a perfect square trinomial you have to divide the middle number by 2 then square it, the number you get should be the last number if it is not that means it is not a perfect square trinomial.

# Math 11 Edublog Post #2

This week the thing that I learned in class that I found the most interesting was how to find the sum of an infinite geometric series. For a geometric series to be infinite the common ratio (r) has to be greater than -1 and less than 1 (Ex. 0.89).

The equation to find the sum of an infinite geometric series you have to use the following equation $a/1-r$

if we had a series with the 1st term being 3 and the difference being 0.72 then the equation would look like the following. $3/1-0.72$ $3/-.28$ $-10.71$