SOLUTION: 3n(7n-20)=96 i have gotten to 21n squared -60=96 then im stuck :( please expain how to work this or at least show the steps.

SOLUTION: 3n(7n-20)=96 i have gotten to 21n squared -60=96 then im stuck :( please expain how to work this or at least show the steps.

Algebra.Com

Question 361097: 3n(7n-20)=96
i have gotten to
21n squared -60=96
then im stuck :(
please expain how to work this or at least show the steps.
Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
3n(7n-20)=96
21n^2-60n=96
21n^2-60n-96=0
21*-96=-2016
what two factors of -2016 have a sum of -60? -84 and 24.
21n^2+24x-84x-96=0
3n(7n+8)-12(7n+8)=0 Factoring by grouping.
(3n-12)(7n+8)=0
.
3n=12
n=4
.
7n=-8
n=-8/7
.
Ed
RELATED QUESTIONS
-|3n-5| is greater than or equal to 7n-15 I don't understand how to show the absolute... (answered by checkley77)

(2x+3)/4 + (x-5) / 3 = 3/2 I have done some of this but i have gotten stuck after this (answered by Cromlix)

I would like help finding the equation to this problem please: The sum of two... (answered by scott8148)

How many Liters of a 60% acid solution must be mixed with a 75% acic solution to get 20... (answered by fractalier)

Can you please show how to collect like terms? Thanks.... (answered by richard1234)

g(x) = 5X/x squared + 25. Please expain to me how to go about finding the domain for this (answered by stanbon)

(x^3+7x^2+7x-15)/(x+3) I have tried to divide this but I get confused, could you please... (answered by Alan3354)

Pls help show steps on how to evaluate: 3n^2-14n+6 divided by... (answered by josgarithmetic)

I need to solve for x in the equation nx=2nx-21n could you please help me. I have tried... (answered by longjonsilver)