25b^2+5b-42 I am trying to factor this trinomial? Would you do it like this 25x42=1050
find two factors 1050 that have a sum of 5

Question

25b^2+5b-42 I am trying to factor this trinomial?  Would you do it like this 25x42=1050
find two factors 1050 that have a sum of 5

anonymous · Answer

Ah, it's simpler to get it all on one side, equaling to zero. So try that.

anonymous · Answer

There is no equals sign @tumblrfanatic

anonymous · Answer

@kelseygirl73 you need factors of -1050, which means the signs of the factors will be opposite.
You need numbers that subtract to make 5.

anonymous · Answer

A shortcut along the way is to see that 25 has very few factors, 1×25, 5^2; and 42 has very few factors: 6×7, etc. so that narrows down your choices quite a bit.

anonymous · Answer

Your numbers are 35-30 =5
35*-30=-1050

It helps to write out the factors you know of, then elaborate on them.