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GED Math Videos 68 videos
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GED Math 5.4 Expression and Equations 251 Views
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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
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