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welshfella
 one year ago
Short tutorial on the 'ac' method of factoring trinomials.
welshfella
 one year ago
Short tutorial on the 'ac' method of factoring trinomials.

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welshfella
 one year ago
Best ResponseYou've already chosen the best response.8We have the standard form f(x) = ax^2 + bx + c . This is called the ac method because we start by multiplying the coefficient a by c. An example will illustrate the method: Factor 4x^2 + 4x  3 ac = 4*3 = 12 Now factor 12: prime factors of 12 are 2*2*3 The middle term + 4x comes from adding 2 terms in x. We are aiming to get the middle term + 4x  so, from the factors, 2*3x  2x looks a good bet So we write 4x^2 + 6x  2x  3 now we try to factor by grouping in this case its easier to see how to do this if we reverse the order of the 2 middle terms 4x^2  2x + 6x  3 = 2x(2x  1) + 3(2x  1) 2x  1 is common to both parts so we have (2x + 3)(2x  1)

welshfella
 one year ago
Best ResponseYou've already chosen the best response.8During my short teaching career I found quite a few pupils had problems with factoring these and this method is the one which most of them took to.

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.0This is called the *headphone* method :P

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.0thats what my teacher told us . dw:1438711610806:dw looks like a headphone ? lol

welshfella
 one year ago
Best ResponseYou've already chosen the best response.8yes that's a good way to remember it !

welshfella
 one year ago
Best ResponseYou've already chosen the best response.8dw:1438711718282:dw

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.0yeah that^^ nvm :) nice work!
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