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Do you mean how to factor it?
Do you know that trinomials come from multiplying two binomials?
So we know it would be ( )( )
yes i get that
We also know that one sign would have to be positive and one negative since the last term is negative. Still with me?
Now how could we possibly get 13x^2 ?
what do u mean?
you can do this by grouping with the ac method: ax^2+bx+c a=13 c=-3 ac=-39x^2 Find two factors of -39 that add up to -38 The factors are -39x and +1x To group, rewrite the equation 13x^2-39x+1x-3 remove like variables 13x(x-3)+1(x-3) remove (x-3) as a factor and combine 13x+1: (x-3)(13x+1)
The first term of the trinomial we are trying to factor is 13x^2. So we have to multiply 2 factors that will give us 13x^2 . What might they be?
Oh. I see that rickjbr wants to help you now so I'll turn you over to him.
didn't mean to jump in
so who's going to help me?
ok so i don't understand why it is (x-3)(13x+1)
if you expand those two binomials, youll get back to your original trinomial using the FOIL method
oh i got it i was just confusing myself
sure no problem