Quadratics
by wont u take me to funkytown on Oct 29, 2008 17:19:09
Simply the most useless maths topic ever. i dont think ill ever be at the shops, looking to buy $2 of bananas and for some reason need to calculate where the bloody
parabola is meant to go on
the x and y
axis. useless. id rather stick my nuts under
Quadratics
by - gillander on Jul 05, 2003 12:06:23
the neatest thing in math ever !!!! you see by using
quadratics to solve equations, your
avoiding the
guess and check method!!!! quadratics are set to zero and have two answers!!!!
Example:
Next year, on the
regents, make sure you use some
quadratics in word probelms, so that you can avoid the
guess and check method, WHICH IS STINKY!!!!!
Quadratic Formula
by LawrenceMK2 on Nov 11, 2020 23:50:19
The best method of solving a quadratic. When your equation is in the standard form of ax² + bx + c = 0, x = (-b ± √b² - 4ac) / 2a. It is far superior to both
factoring and
completing the square. The equation may look difficult, but all you have to do is plug in the
coefficients and simplify!
quadratic formula
by "Seagaia" on May 20, 2005 05:35:10
A handy formula easily memorized by repetition. It is used in many instances, such as trying to find the roots of an equation, or solving an equation that will not factor with integers.
To solve using the Quadratic Formula:
In any equation
ax^2+bx+c,
The roots can be found by substituting into:
-b(+,-)
sqrt(
b^2-4ac)/2a
OR
Negative "B" plus or minus the square root of "B" squared minus 4(a)(c), all
divided by 2(a).
Example:
To solve using the Quadratic Formula:
In any equation
ax^2+bx+c,
The roots can be found by substituting into:
-b(+,-)
sqrt(
b^2-4ac)/2a
OR
Negative "B" plus or minus the square root of "B" squared minus 4(a)(c), all
divided by 2(a).
EX:
Hm..
10x^2+13X-5
-13(+,-)sqrt(169+200)/20
>_>
In other words, by substituting the numbers in, you get 13(+,-)sqrt(369)/20.
As you may or may not have guessed, this gives you a very nasty number, which should be approximated and rounded to the nearest thousandth.