This discussion is closed.
......?
Badges: 0
Rep:
?
#1
Report Thread starter 16 years ago
#1
how would you factorise 3r^2 + 2n^2 - 10/3*n*r to make it equal r or n
0
john !!
Badges: 14
Rep:
?
#2
Report 16 years ago
#2
that's an expression, you can't make anything equal anything in an expression. you need two expressions with a common relationship to make an equation.
0
......?
Badges: 0
Rep:
?
#3
Report Thread starter 16 years ago
#3
how would you factorise 3r^2 + 2n^2 - 10/3*n*r = 0 to make it equal r or n
0
IntegralAnomaly
Badges: 0
Rep:
?
#4
Report 16 years ago
#4
(Original post by silent p......?)
how would you factorise 3r^2 + 2n^2 - 10/3*n*r = 0 to make it equal r or n
well,to make life easier u can multiply everything by 3...........
0
Euler
Badges: 3
Rep:
?
#5
Report 16 years ago
#5
(Original post by silent p......?)
how would you factorise 3r^2 + 2n^2 - 10/3*n*r = 0 to make it equal r or n
Are you trying to solve the equation and find values of r and n?

And which one is the right equation?

3r^2 + 2n^2 - (10/3)(n)(r) = 0

OR

3r^2 + 2n^2 - 10/(3nr) = 0
0
......?
Badges: 0
Rep:
?
#6
Report Thread starter 16 years ago
#6
r or n and

3r^2 + 2n^2 - (10/3)*nr = 0
0
IntegralAnomaly
Badges: 0
Rep:
?
#7
Report 16 years ago
#7
(Original post by silent p......?)
r or n and

3r^2 + 2n^2 - (10/3)*nr = 0
multiply by 3 to get 9r^2 + 6n^2 -10nr=0,which errrr cannot be simplified to (an+br)(cn+dr)=0
0
......?
Badges: 0
Rep:
?
#8
Report Thread starter 16 years ago
#8
it's impossible?
0
IntegralAnomaly
Badges: 0
Rep:
?
#9
Report 16 years ago
#9
(Original post by silent p......?)
it's impossible?
sorry to break it 2 ya
0
elpaw
Badges: 15
Rep:
?
#10
Report 16 years ago
#10
(Original post by silent p......?)
r or n and

3r^2 + 2n^2 - (10/3)*nr = 0
9r² - 10nr +6n² = 0

r = [10n+-√(100n²-216n)]/18
OR
n = [10r +-√(100r²-216r)]/12


this only works for 0 >= n,r or n,r >= 2.16
0
X
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

How will you be receiving your results?

Going into school to pick them up (186)
33.45%
Receiving them online / by email (277)
49.82%
I still don't know (93)
16.73%

Watched Threads

View All