 How come 4ac is used in so many algebra formulas? - XP Math - Forums Sign Up FREE! | Sign In | Classroom Setup | Common Core Alignment  XP Math - Forums How come 4ac is used in so many algebra formulas? 08-01-2007 #1 walla walla Guest   Posts: n/a How come 4ac is used in so many algebra formulas? Quadratic formula, Finding y value of a circle in standard form, etc..  08-01-2007 #2 Brian D Guest   Posts: n/a it is one of those special relationships ....(like pi and a curve)  08-01-2007 #3 Agnau Guest   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 Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode 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 Rules
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