Question

how do you factor 3b^2-9b-30

Answer 1

Use the factor theorem so anything that 30 can be divisible by in the positive and negative. and that equals to zero.

Answer 2

and then you can use synthetic or long division.

Answer 3

Oh ok I see. Thank you!

Answer 4

First remove the 3 which is common to all terms now you have
3(b^2-3b-10)
now it appears that the expression in the parenthesis can now be factored.

Answer 5

That makes sense. But im not really sure how to factor from there

Answer 6

http://www.wolframalpha.com/

Your best buddy

Answer 7

3(b-5)(b+2). Note that the product of -5 and +2 = -10 which is needed for the last term, further note the the sum of -5 and +2 is equal to -3 which is needed in the 2nd term.

Answer 8

Haha, simpler your way.

Answer 9

And as jiji501 posted that link can be very helpful.

Answer 10

cool. i'll check it out!:D and thanks radar and jiji501