ShmoopTube
Where Monty Python meets your 10th grade teacher.
Search Thousands of Shmoop Videos
Algebra II Videos 54 videos
Mosquitos need their caffeine, just like the rest of us. Wouldn't think zipping around and stinging people all day long sap your energy?
GED Math 5.4 Expression and Equations 252 Views
Share It!
Description:
GED Math 5.4 Expression and Equations. Which of the following answer choices correctly solves for x with the quadratic formula?
Transcript
- 00:00
Thank you We sneak in and here's your smoked cheese
- 00:04
You were brought to you by the quadratic formula it's
- 00:07
quadratic systematic hydra matic and it's hardly a watch grease
- 00:12
last night All right five x minus one minus three
- 00:15
expert equals seven And which of the following answers choices
Full Transcript
- 00:17
correctly solved for acts with the quadratic formula And here
- 00:21
the potential answers So quadratic formula how do we love
- 00:28
the let us count the ways one okay Yeah we're
- 00:31
done counting well if we're going to do anything with
- 00:34
quadratic formula we always need our equation to be set
- 00:37
equals zero so let's do that for wei take five
- 00:40
x minus one minus three x squared equals seven subtract
- 00:43
seven from both sides and get five Acts minus 8
- 00:47
minus 3 x squared equals zero also it's going to
- 00:49
cause far fewer headaches if you put this thing in
- 00:51
order of descending terms so let's rewrite it as negative
- 00:54
three x squared plus five x minus eight equals zero's
- 00:57
like that and we know that minus three is are
- 00:59
a coefficient five is our vehicle efficient and negative eight
- 01:03
is our sea coefficient if you have the quadratic formula
- 01:06
memorize on boy we sure hope you do Then we
- 01:09
can just plug in our coefficients and it'll give us
- 01:11
x equals negative five plus or minus the square root
- 01:16
of five squared minus four times negative three times negative
- 01:21
eight all over two times negative three when we don't
- 01:24
even have to simplify all that nonsense because we already
- 01:26
have an exact match for that in our answer choice
- 01:29
which is a almost looks good enough to eat doesn't 00:01:31.854 --> [endTime] it
Related Videos
GED Math: Graphs and Functions Drill 5, Problem 5. What is the value of a?
GED Math: Measurement Drill 1, Problem 1. The area, in square inches, of the shaded region where the two rectangles overlap is...what?
GED Math 1.1 Graphs and Functions. Which is the appropriate region of the coordinate plane?
GED Math: Expression and Equations Drill 1, Problem 1. How much do the apples cost after tax?
We don't like knocking people down to size, but we do like simplifying radicals. Join us?