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avatar+9675 

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.

2x2+11x+5=(ax+b)(cx+d)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+9675 
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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+9675 
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Thanks for the answer, but my level requires cross-method, but I never understand it :(

 Sep 18, 2016

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