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3x^2+9x+6

2006-11-18 12:29:02 · 9 answers · asked by Keith C 2 in Science & Mathematics Mathematics

9 answers

Factor out the 3:
3(x^2+3x+2)
Unfoil:
3(x+1)(x+2)
Take the roots:
x=-1 or -2

2006-11-18 12:32:10 · answer #1 · answered by banan 2 · 1 1

This is a classic case of having trouble factorising quadratic polynomials. People have had problems with this in the past. Maybe you should see 'similar questions' before wasting 5 points. Anyway, here's the answer:
3x^2+9x+6
The easieast way to factorise this is to split the middle term, that is '9x' into two terms. In order to get the two apprpriate terms needed, follow these steps:
1. Multiply the coefficient of the first term with the last term. (3*6 = 18)
2. Factorise the product (18)
18 = 1*18
2*9
3*6
3. Pick out two factors that add up to make the coefficient of the middle term. (3 + 6 = 9)
4.Split the middle term (9x = 6x + 3x)

Now let's get on with the factorisation:
3x^2+9x+6 = 3x^2 + 6x + 3x + 6
= 3x(x + 2) + 3(x + 2)
= (3x + 3)(x + 2)

2006-11-18 13:00:20 · answer #2 · answered by Akilesh - Internet Undertaker 7 · 0 1

I assume you mean factor, you didn't say
3x^2+9x+6
3(x^2+3x+2)
3(x+2)(x+1)

2006-11-18 14:32:11 · answer #3 · answered by yupchagee 7 · 0 0

I'm assuming it's = 0 but even if it isn't the factorization is still correct.
3(x^2 + 3x +2) = 0
3(x+1)(x+2)=0
thus x = -1 or x = -2

2006-11-18 12:46:13 · answer #4 · answered by Insomniac 1 · 0 1

3x^+2+9x+6
Group like terms, we get
3x^+9x+2+6
9x+9x+2+6
Adding like term, we get
18x+8
ans = 18x+8

2006-11-18 12:51:35 · answer #5 · answered by Jay 2 · 0 1

90

2006-11-18 12:37:43 · answer #6 · answered by Christine 4 · 0 2

One can but I think it may be assigned to you. So the question is ' can you solve this problem.'

2006-11-18 12:45:27 · answer #7 · answered by BILL 6 · 0 1

what am i supposed to solve for? thats just a function

2006-11-18 12:30:58 · answer #8 · answered by sprinter/jumper40 1 · 2 1

My dad said the first x shouldn't be there.

2006-11-18 12:41:05 · answer #9 · answered by Jenny Yin 2 · 1 1

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