Question

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Answer 1

so, use the quadratic formula, ax^2+bx+cx

Answer 2

ok what times what is 60?

Answer 3

well we will eventually find that its factors dont fit in with the 3x. so we have to work around this.

Answer 4

you understand that so far?

Answer 5

right but even if you but this in standard form (x+10) (x-6) you get 4x not 3x. also, you have a 3 in front of your x^2. so we know we have to have a number outside the parenthesis correct?

Answer 6

yup.
so now, through the process of elimination we know it should look something like this
3(x-?)(x+?)

Answer 7

now, you solve for factors that when times by 3 is equal to 60.
well, 60 divided by 3 is?

Answer 8

yes!

Answer 9

very good. now you just plug them in where they will work.
see if you can do that. you need a negative 60 and a negative 3x. so use the minus or plus signs where this will be the result.

Answer 10

you got it! hope that helped. there is an equation for this but usually this is how i do these :)

Answer 11

Well, what is your teacher looking for? the equation form or a walk through like i just explained to you?

Answer 12

Alright well going back to the start, you see that its 3x^2 so you know you will have to factor out 3. just go from there. explain how then you found 4 and 5.

Answer 13

oh lord. i haven't done this in too long. it may be 5. hopefully someone else will know.