Oh dear god, please make the hurt stop!
[quote]LiveFromThe781 wrote:
Multiply
(8x+3)(4x^2+8x+9)
[/quote]
Ans. = 32x^3 + 76x^2 +96x 27
Ans. = 80
Ans. = 2m^2 + 5m -16
[quote]DickBag wrote:
this kind of maths is annoying. if it were calculus, i might help.
but algebra is just to damn tedious. and uncool[/quote]
You could make fun of the Ma7h n00bs, like everyone else.
Everyone else, except the good posters trying to help them, of course.
Drivethruhero where are you???
[quote]B rocK wrote:
I passed all my algebras, geometry, 3 calc classes and differential equations. I’m done.
pulling all nighters for all my college math finals somehow allowed me to smoke the finals. i just don’t get it. 30min of sleep after 14hrs of studying and i get an 89 on the final?
no more.
good luck with the math. in the real world they let us use calculators and other people. aka asians.[/quote]
which is why im taking “contemporary math” next semester instead of college algebra. i guess contemporary math is some secret math only the cool kids know about and its easy but satisfies the same requirments as harder maths intermediate algebra, statistics, matrixes etc.
factor
112v^2+280v+175
i cant find any number that goes into all 3 evenly
the length of a table top is 4 m greater than the width. the area is 77m^2. Find the dimensions
its a pain in the ass trying to copy what i have on my paper to the screen especially when theres no math keys.
but right now heres where im stuck
(w^2)(4w) - 154 = 0
i cant find a number that adds to equal 4 but multiplys to get -154. is there some kind of easier method to find this out other than jamming numbers on a calculator for 45 minutes?
[quote]
77 to the power of 2 (squared)
m = the unit of measurement.
maybe i shouldnt have put it right next to the term like that.
[quote]LiveFromThe781 wrote:
the length of a table top is 4 m greater than the width. the area is 77m^2. Find the dimensions
its a pain in the ass trying to copy what i have on my paper to the screen especially when theres no math keys.
but right now heres where im stuck
(w^2)(4w) - 154 = 0
i cant find a number that adds to equal 4 but multiplys to get -154. is there some kind of easier method to find this out other than jamming numbers on a calculator for 45 minutes?[/quote]
width = W
Length = (w + 4)
Area = W (w + 4)
Area = 77
W^2 + 4W = 77
Use the quadratic formula and solve for W. Or graph it and the points that it crosses the X axis will be your width’s
[quote]LiveFromThe781 wrote:
factor
112v^2+280v+175
i cant find any number that goes into all 3 evenly[/quote]
In the quadratic equation it ends up with 280/224=1.25, so you’re gonna want to look for some numbers that end up with a 4/5 ratio within the equaion.
Thats a toughie right there. Sorry I’m worried about psychology right now, otherwise I would try and work it out, (28x+ something)(4x+ something) seems like it might have potential?
[quote]elano wrote:
Order of operations. That sucks.
Please excuse my dear aunt sally.
Parentheses
Exponent
Multiply
Divide
add
subtract
[/quote]
Man I forgot all about that
[quote]stumpy wrote:
LiveFromThe781 wrote:
the length of a table top is 4 m greater than the width. the area is 77m^2. Find the dimensions
its a pain in the ass trying to copy what i have on my paper to the screen especially when theres no math keys.
but right now heres where im stuck
(w^2)(4w) - 154 = 0
i cant find a number that adds to equal 4 but multiplys to get -154. is there some kind of easier method to find this out other than jamming numbers on a calculator for 45 minutes?
width = W
Length = (w + 4)
Area = W (w + 4)
Area = 77
W^2 + 4W = 77
Use the quadratic formula and solve for W. Or graph it and the points that it crosses the X axis will be your width’s
[/quote]
graph it? theres no graphing in this and i dont know what the quadratic formula is. dude i dont even know foil 100%
and the length is +4 the width is -4
You’re in college and you don’t know the quadratic formula?
x = (-b +/- sqrt(bxb-4ac))/2a
A is the coefficient in front of the Xsquared term, B is the coefficient in front of the X term, C is the coefficient in front of the straight number.
And may God have mercy on your soul.
[quote]Otep wrote:
You’re in college and you don’t know the quadratic formula?
x = (-b +/- sqrt(bxb-4ac))/2a
A is the coefficient in front of the Xsquared term, B is the coefficient in front of the X term, C is the coefficient in front of the straight number.
And may God have mercy on your soul.[/quote]
I can still sing the song…
Linear algebra, differential equations, discrete mathematics, geometry and statistics will be the most useful math classes you’ll ever take.
Physics made no sense until I took diff eq’s. Discrete math is awesome for pattern recognition, stats’s utility is obvious…
[quote]LiveFromThe781 wrote:
factor
112v^2+280v+175
i cant find any number that goes into all 3 evenly[/quote]
If you have to factor a polynomial (especially a quadratic polynomial), it can be done by finding the roots with the quadratic formula. So, the roots of the polynomial 112 v^2 + 280 v + 175 are
root_1 = (-280 + sqrt(280^2 - 4 * 112 * 175))/(2 * 112)
and
root_2 = (-280 - sqrt(280^2 - 4 * 112 * 175))/(2 * 112).
Each of these roots corresponds to a factor of the polynomial. That is,
112v^2+280v+175 = (v - root_1) * (v - root_2).
A simpler example:
Factor x^2 + 3x + 2.
The roots of this, by the quadratic equation, are:
(-3 +/- sqrt(3^2 - 412))/(2*1) = -1 and -2.
So, x^2 + 3x + 2 = (x - (-1)) * (x - (-2)) = (x + 1) * (x + 2),
just like you’d expect by factoring the regular way.
Sometimes, it’s too hard to factor by guessing, so it’s better to use the quadratic formula to find the roots.
This is why the Indians and Chinese own every technical contracting job across the US.
You could also just know that 7 is a factor of 112/280/175… but that would be too easy
[quote]red04 wrote:
You could also just know that 7 is a factor of 112/280/175… but that would be too easy[/quote]
yeah, cause its so obvious.