Quantcast How come 4ac is used in so many algebra formulas? - XP Math - Forums
XP Math Home Sign Up FREE! | Sign In | Classroom Setup | Common Core Alignment PDF Version

Go Back   XP Math - Forums > Welcome > Off-Topic Discussion

Thread Tools Display Modes
Old 08-01-2007   #1
walla walla
Posts: n/a
Default How come 4ac is used in so many algebra formulas?

Quadratic formula, Finding y value of a circle in standard form, etc..
Old 08-01-2007   #2
Brian D
Posts: n/a

it is one of those special relationships ....(like pi and a curve)
Old 08-01-2007   #3
Posts: n/a

It comes from having the standard notationswhen trying to derive the formulas. And so many formulas in algebra are interconnected at some level. For example: a^2+b^2=r^2 is the basic circle... to solve for a or b, you apply the qaudratic formula because everything is sqaured and that is it's purpose. And if A = pi(r^2) then A/pi = a^2+b^2 and you can again apply the qaudratic formula to find a or b. Notice that the circle formula is also the right triangle formula ala Pythagorea. An ellipse is a formula of for a^2/c^2+b^2/d^2=1.... again, the quadratic formula will eventually come into play.... with a bit tweaking -- thankfully c and d are constants (notice that when c=d you have a circle).

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT -4. The time now is 11:27 PM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
XP Math