S sejohnson456 New member Joined Apr 19, 2011 Messages 1 Apr 19, 2011 #1 how do I write a quadratic formula using a list of numbers with a pattern , for example : 1 4 9 16 *1-4 is +3 *4-9 is +5 *9-16 is +7 **3-5 is +2 **5-7 is +2 I know that means it's a second degree equation but i don't remember how to write it

how do I write a quadratic formula using a list of numbers with a pattern , for example : 1 4 9 16 *1-4 is +3 *4-9 is +5 *9-16 is +7 **3-5 is +2 **5-7 is +2 I know that means it's a second degree equation but i don't remember how to write it

tkhunny Moderator Staff member Joined Apr 12, 2005 Messages 9,787 Apr 19, 2011 #2 Re: helpmepleaseeeee Why is this in "Geometry and Trig"? Most notably, 1-4 is NOT +3. EVERYTHING is backwards. Very troubling. If y = a*x^2 + b*x + c... That "2" you ended with is twice "a", so 2*a = 2 or a = 1. y = x^2 + b*x + c Now what?

Re: helpmepleaseeeee Why is this in "Geometry and Trig"? Most notably, 1-4 is NOT +3. EVERYTHING is backwards. Very troubling. If y = a*x^2 + b*x + c... That "2" you ended with is twice "a", so 2*a = 2 or a = 1. y = x^2 + b*x + c Now what?