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You are not logged in. #1 20051127 05:09:14
Factorising QuadraticsI was revising some chapters of my A level maths, I was wondering; Last edited by rickyoswaldiow (20051127 05:09:58) Aloha Nui means Goodbye. #2 20051127 06:31:17
Re: Factorising QuadraticsThe best way to describe the method is just to give an example. Why did the vector cross the road? It wanted to be normal. #3 20051127 06:59:23
Re: Factorising Quadraticsso if we have ax^2 + bx + c we need to find 2 numbers that add to give b and multiply to give a*c? Last edited by rickyoswaldiow (20051127 07:00:51) Aloha Nui means Goodbye. #4 20051127 07:59:54
Re: Factorising QuadraticsExactly. You can then use those two numbers to split up the b and that helps you factorise the quadratic easier. Why did the vector cross the road? It wanted to be normal. #5 20060124 01:53:55
Re: Factorising QuadraticsI am stuck on the question y=2x^2  7x + 15 where I need to sketch the curve. Aloha Nui means Goodbye. #6 20060124 01:58:13
Re: Factorising Quadratics(ax + b) (cx + d) Last edited by rickyoswaldiow (20060124 02:09:42) Aloha Nui means Goodbye. #7 20060124 04:54:29
Re: Factorising Quadraticssolved Aloha Nui means Goodbye. #8 20060124 07:55:49
Re: Factorising Quadratics(2x+3)(x+5) #9 20060213 06:00:35
Re: Factorising QuadraticsI'm still having quite a bit of confusion over finding the coefficients of the x in (dx + e) (fx + g). I can follow your examples and do other similar sums myself but I want to know an exact way of getting those coefficients for my C++ based computer program. Aloha Nui means Goodbye. #10 20060213 06:49:32
Re: Factorising QuadraticsIn finding the factors of ax² + bx + c = 0 Last edited by irspow (20060213 07:47:36) #11 20060213 09:05:18
Re: Factorising QuadraticsYou could try something like this to find f1 or f2. #12 20060215 02:34:18
Re: Factorising Quadraticswhat does the % operator do? Aloha Nui means Goodbye. #13 20060215 07:55:29
Re: Factorising QuadraticsIt's been a while, but I believe that in C++ it is the modulus(?) function. It only returns an integer value for a fraction (or division). What the statement up there would do is check whether it is true that n goes evenly into a and d. If it didn't go in evenly then the integer answer wouldn't match the float answer. Being false, it would not assign f1 = n. #14 20060215 08:19:40
Re: Factorising Quadratics% returns the remainder of division: "In the real world, this would be a problem. But in mathematics, we can just define a place where this problem doesn't exist. So we'll go ahead and do that now..." #16 20060215 10:04:41
Re: Factorising QuadraticsYep. The syntax is a bit weird becaue there is no mathimatical equivalent (that I know of). The only thing close is: "In the real world, this would be a problem. But in mathematics, we can just define a place where this problem doesn't exist. So we'll go ahead and do that now..." 