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avatar+9673 

I always factor trinomials that are not perfect squares in a different way as yours, I need steps though, I do it in 1 step.

\(2x^2 + 11x + 5\\ = (ax + b)(cx + d) \text{Where } ac = 2,\;bc + ad = 11,\;bd = 5\\ = (2x + 1)(x+5)\)

The (ax + b)(cx + d) step is my thinking method, I usually write 2x^2 + 11x + 5 = (2x + 1)(x + 5).

 Sep 18, 2016
 #1
avatar+9673 
0

I don't really understand cross-method, I am confused when I am doing it, it made me cross, but not made me doing factorization :(

 Sep 18, 2016
 #2
avatar+12530 
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One could still calculate the zeros.

laugh

 Sep 18, 2016
 #3
avatar+9673 
0

Thanks for the answer, but my level requires cross-method, but I never understand it :(

 Sep 18, 2016

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