Announcements
#1
Given that x^2 + 8kx +k =0 has equal roots

Find the value of K

I put it into b^2 - 4ac and so now have (8k)^2 - 4K = 0
What do I do next?
0
3 years ago
#2
(Original post by Farmerjj)
Given that x2 + 8kx +k =0 has equal roots

Find the value of K

I put it into b2 - 4ac and so now have (8k)2 - 4K = 0
What do I do next?
now solve that mofo
0
3 years ago
#3
Make K the subject of the formula after applying the squared on 8k. giving you 64k^2 - 4k = 0 . Try and work from there
0
#4
(Original post by the bear)
now solve that mofo
How
0
#5
Make K the subject of the formula after applying the squared on 8k. giving you 64k^2 - 4k = 0 . Try and work from there
Nope no idea sorry I don't see how you can get an answer from that
0
3 years ago
#6
(Original post by Farmerjj)
How
If you expand it then you've got a quadratic equation that can be solved by factorising.

It's similar to how you would solve something like . How would you solve this?
0
#7
(Original post by notnek)
If you expand it then you've got a quadratic equation that can be solved by factorising.

It's similar to how you would solve something like . How would you solve this?
You would factorise to (X-2)(X+2)
0
3 years ago
#8
Make K the subject of the formula after applying the squared on 8k. giving you 64k2 - 4k = 0 . Try and work from there
now factorise into two brackets... or you could use the Quadratic Formula ?
0
3 years ago
#9
0
3 years ago
#10
(Original post by the bear)
now factorise into two brackets... or you could use the Quadratic Formula ?
Wrong person XD but yes OP do what this person has said
0
#11
Cheers man thanks I've got it now, just had a brain dead moment but thanks you

(1/16) is correct?
0
#12
(Original post by the bear)
now factorise into two brackets... or you could use the Quadratic Formula ?
Done now cheers bear 🐻
1
3 years ago
#13
64k^2-4k=0

k(64k-4)=0

k=0, 64k-4=0
64k=4
k=1/16

so, k=0 and k=1/16
0
3 years ago
#14
Wrong person XD but yes OP do what this person has said 0
3 years ago
#15
(Original post by Farmerjj)
Cheers man thanks I've got it now, just had a brain dead moment but thanks you

(1/16) is correct?
Its partly correct. However you are missing roots.
0
3 years ago
#16
(Original post by doon98)
64k^2-4k=0

k(64k-4)=0

k=0, 64k-4=0
64k=4
k=1/16

so, k=0 and k=1/16
complete answers are discouraged 0
3 years ago
#17
(Original post by doon98)
64k^2-4k=0

k(64k-4)=0

k=0, 64k-4=0
64k=4
k=1/16

so, k=0 and k=1/16
Do avoid giving straight out answers as we'd prefer to try and explain them through it on TSR
0
3 years ago
#18
(Original post by doon98)
64k^2-4k=0

k(64k-4)=0

k=0, 64k-4=0
64k=4
k=1/16

so, k=0 and k=1/16
nice one doon bear
0
X

new posts Back
to top
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

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

### University open days

• University of Hertfordshire
Sat, 16 Nov '19
• University of Roehampton
Sat, 16 Nov '19
• Swansea University
Sat, 16 Nov '19

### Poll

Join the discussion

#### Which party will you be voting for in the General Election?

Conservatives (49)
18.77%
Labour (106)
40.61%
Liberal Democrats (53)
20.31%
Green Party (16)
6.13%
Brexit Party (7)
2.68%
Independent Group for Change (Change UK) (0)
0%
SNP (4)
1.53%
Plaid Cymru (5)
1.92%
Democratic Unionist Party (DUP) (0)
0%
Sinn Fein (0)
0%
SDLP (0)
0%
Ulster Unionist (0)
0%
UKIP (2)
0.77%
Other (3)
1.15%
None (16)
6.13%