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Need help with quadractic equation

do you mean y=x^2-6x+5?

wouldn't it be -5 and -1?

y=(x-5)(x-1)
y=x^2-5x-1x+5
y=x^2-6x+5

And why the heck do you need the quadratic equation for that, you should be able to spot these things when they are that simple.
 
Wouldn't this be the kind of question you would DEFINITELY know how to do if you had only listened in class?

DO YOUR OWN HOMEWORK.

This wasn't even some trick qn. It's straight forward solving of Quad Eqns in the simplest form possible. No need for b^2-4ac formula, no completing the square.
 
Originally posted by: Kenazo
do you mean y=x^2-6x+5?

wouldn't it be -5 and -1?

y=(x-5)(x-1)
y=x^2-5x-1x+5
y=x^2-6x+5

And why the heck do you need the quadratic equation for that, you should be able to spot these things when they are that simple.
Click to expand...

How would you graph this out?
 
Originally posted by: Fx02
Originally posted by: Kenazo
do you mean y=x^2-6x+5?

wouldn't it be -5 and -1?

y=(x-5)(x-1)
y=x^2-5x-1x+5
y=x^2-6x+5

And why the heck do you need the quadratic equation for that, you should be able to spot these things when they are that simple.
Click to expand...

How would you graph this out?
Click to expand...
AHHHHHHHHHHHHHHHHHHHHHHHHHHHH
 
Originally posted by: Fx02
Originally posted by: Kenazo
do you mean y=x^2-6x+5?

wouldn't it be -5 and -1?

y=(x-5)(x-1)
y=x^2-5x-1x+5
y=x^2-6x+5

And why the heck do you need the quadratic equation for that, you should be able to spot these things when they are that simple.
Click to expand...

How would you graph this out?
Click to expand...


Figure it out. 🙂 Do it manually if you have to, make a chart of X and Y values for everything from X=-5 to x= +5.

Of course the easier thing to do would be to realize that you can figure out your X intercepts from the y=(x-5)(x-1) thing. Hint: your x intercepts occur when Y=0, so what numbers can you plop into y=(x-5)(x-1) to make the equation = 0?
 
Originally posted by: ActuaryTm
Originally posted by: nycxandy
Wow... simply astounding.
Click to expand...
It is the responses in threads such as this that utterly scare me to no end.
Click to expand...
Are you saying that the public school is so bad that students need rely on people like us to teach them how to factor quadratic equations?
 
Originally posted by: Howard
Are you saying that the public school is so bad that students need rely on people like us to teach them how to factor quadratic equations?
Click to expand...
To some degree, certainly.

The educational system in this country (speaking of the US) in general is simply saddening; even moreso upon the realization that a number of those responsible for teaching the material can hardly comprehend it themselves. The on-demand culture in which we reside does not help matters either, which generally encourages students to seek easy answers online rather than performing the work themselves; not that online help in general is necessarily a bad thing, mind you - in fact, in a number of cases (Math Forum/Ask Dr. Math) it can be a terrific asset.

Another example of our society "dumbing down", unfortunately.
 
you spelled quadratic wrong.

x^2+6x+5=y

can you think of a multiple of 5 that adds to 6? 1 is a factor of 5 and 5+1 = 6, so

(x+1)(x+5) = x^2 + 1x + 5x+ 5 = x^2 + 6x + 5

and yeah, you need to start using your brain and do your homework, this is some easy sh!t.
 
Originally posted by: alphatarget1
you spelled quadratic wrong.

x^2+6x+5=y

can you think of a multiple of 5 that adds to 6? 1 is a factor of 5 and 5+1 = 6, so

(x+1)(x+5) = x^2 + 1x + 5x+ 5 = x^2 + 6x + 5

and yeah, you need to start using your brain and do your homework, this is some easy sh!t.
Click to expand...
Telling him what to do won't help him on a test, because he won't understand what he's doing.

Then again, it's fine if you just want him to go away. 😛
 
Originally posted by: Fx02
Originally posted by: Kenazo
do you mean y=x^2-6x+5?

wouldn't it be -5 and -1?

y=(x-5)(x-1)
y=x^2-5x-1x+5
y=x^2-6x+5

And why the heck do you need the quadratic equation for that, you should be able to spot these things when they are that simple.
Click to expand...

How would you graph this out?
Click to expand...

:Q Plot a quadratic equation? You mean... Y as a function of X? That's insane! No one knows how to do that. You would need a supercomputer running several centuries before you can even come close to getting anything that resembles a plot. I think you should go to your teacher and complain that this is an unfair question. 😀
 
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