Pre-Algebra: Chapter 8-7
X and Y intercepts
The x-intercept we find by setting the y value to 0. We are finding where the linear equation crosses the x axis. The y-intercept is found by setting the x value to 0 and solving for y. With these 2 points, we can then plot a line.
A horizontal line has 0 slope and a vertical line has NO slope (or undefined slope). Here is a link too!
Algebra: Chapter 6-5
Equations of the form ax^2 + bx + c
Using the BOX METHOD OF FACTORING will make your job much easier with trinomials that have coefficients in front of the x^2, TRUST ME!
If you want to do it the traditional way (I’m not sure why), the following will help too:
To factor ax^2 + bx + c, we look for binomials that look like this with the _ signifying the values we are trying to find
( _x + _ ) * ( _x + _ )
where products of numbers in the blanks are as follows:
- The numbers in the FIRST blanks of each binomial have product a.
- The numbers in the LAST blanks of each binomial have product c.
- The OUTSIDE product and the INSIDE product have a sum of b.
We do the same thing when we use the BOX METHOD and the X product and sum thingy! DO IT THAT WAY, SAVE YOURSELF SO GRIEF. THIS STUFF IS HARD!!