Question

Fctoring Trinomials?..... Please Help>>
7x^2+20x-3

Answer 1

Factor by grouping: multiply the first and last coefficient (7 x -3 = -21), then find two numbers that multiply to that and add to the middle coefficient (-20). They are -21 and 1. Split your middle term using those two numbers. You now have 4 terms. Group the first two together and last two together. Factor out what you can and find the binomial (x - 3) to be a common factor. Factor out the binomial (leaving 7x + 1) and you are done:

7x^2 - 20x - 3

Answer 2

Can you explain it better? Please @pooja195

Answer 3

is it 7x^2-20x-3? @pooja195

Answer 4

yep srry i tried to explain the best i could

Answer 5

Is that the answer? and it fine ill figure it out also why is it suppose to be 20? @pooja195

Answer 6

Sorry about my question on why is it 20 forget about that but what is the answer? @pooja195

Answer 7

7x^2 - 20x - 3

Answer 8

(x+3) (7 x-1)
See the attached plot.
-3 seems to be a root.
Divided the polynomial by x+3 using synthetic division and see what you get.

Answer 9

I dont think im suppose to graph it? @robtobey

Answer 10

Well I usually plot these things as a matter of course. 0.006 seconds to do this one using Mathematica 9 on an Apple IMac.

Your instructor is probably not expecting a plot.

Answer 11

No shes not but i figured out the problem already thanks for you help @robtobey