anonymous
  • anonymous
Factoring a Trinomial?
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
\[12x ^{2}-31x+7\]
jim_thompson5910
  • jim_thompson5910
have you learned the quadratic formula?
anonymous
  • anonymous
Yes, I've gotten every other question correct, it's just this one question that i'm getting wrong.

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jim_thompson5910
  • jim_thompson5910
ok use the quadratic formula to find the solutions to 12x^2 - 31x + 7 = 0 tell me what those roots are
anonymous
  • anonymous
http://www.mesacc.edu/~scotz47781/mat120/notes/factoring/trinomials/a_is_not_1/trinomials_a_is_not_1.html
anonymous
  • anonymous
this will help you so much its a trick where you can solve any trinomial
anonymous
  • anonymous
basically you times the first term by last term which in ur case is 12 and 7
anonymous
  • anonymous
\[12 \times 7 = 84\]
anonymous
  • anonymous
now you need to find two factors of 84 which if multiply gives you 84 and when add gives you -31
anonymous
  • anonymous
so if you \[28 \times 3 = 84\]
anonymous
  • anonymous
now in order to get -31 these two number should be -28 and -3
anonymous
  • anonymous
\[(-28) + (-3)\]
anonymous
  • anonymous
now you equation will be \[12x ^{2} -3x -28x +7\]
anonymous
  • anonymous
now only thing you have to do is factor it , can u plz do that if u have trouble i ll help u
skullpatrol
  • skullpatrol
|dw:1442412239372:dw|

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