silly maths problem.. hlep meh!

We

= 2+/- √12... this right?

its ordinary exam paper question, help me and practice your maths skillz at the same time !

help appreciated
...

Trotter

2+ or - √12 is what I got anyway. Delighted with myself. Never lost it


Edit.. Disgusted with myself again.. Textbook error. I'll stick to doing tens and units

BlindedByGInge

We wrote: »

= 2+/- √12... this right?

its ordinary exam paper question, help me and practice your maths skillz at the same time !

help appreciated

No i think its, -b= 4+/-
√12

---

2


divide the 4 by 2 and also the √12

To divide it into √12: make it √4 on the bottom, put the sq root around the fraction;
12
√---
4
like this, kinda, hard to format


= 2+/- √3

Richard

BlindedByGInge wrote: »

No i think its, -b= 4+/-
√12

---

2


divide the 4 by 2 and also the √12

To divide it into √12: make it √4 on the bottom, put the sq root around the fraction;
12
√---
4
like this, kinda, hard to format


= 2+/- √3

This is correct, you can do it by completing the square.

.:FuZion:.

BlindedByGInge wrote: »

No i think its, -b= 4+/-
√12

---

2


divide the 4 by 2 and also the √12

To divide it into √12: make it √4 on the bottom, put the sq root around the fraction;
12
√---
4
like this, kinda, hard to format


= 2+/- √3

This guy knows his maths. :cool: Thats what I got.

Trotter

BlindedByGInge wrote: »

No i think its.......2+/- √3

DOH!!! You're right. How the mighty have fallen. I have lost it afterall

.:FuZion:.

Trotter wrote: »

DOH!!! You're right. How the mighty have fallen. I have lost it afterall

:pac: :pac: * Give him another! *

Delta Kilo

Yep it is plus or minus 2 root 3.

OP, the root of 12 can be broken down into 4 root 3. Then divide by the 2.

We

I gets it now, silly mistake... thanks lads

@Trotter, at least you can be confident that your on par with me, a generally A/B student in pass maths

Trotter

We wrote: »

I gets it now, silly mistake... thanks lads

@Trotter, at least you can be confident that your on par with me, a generally A/B student in pass maths

I got an A1 in pass 10 years ago.. clearly I need a little "maintenance"

BlindedByGInge

.:FuZion:. wrote: »

This guy knows his maths. :cool: Thats what I got.

Haha thanks, but an inflated ego is not what i need right now , im doing my leaving cert this year so its all fresh in the memory.

.:FuZion:.

BlindedByGInge wrote: »

Haha thanks, but an inflated ego is not what i need right now , im doing my leaving cert this year so its all fresh in the memory.

Haha Yeah im doin mine to, but I rarely need to use the -B formula. :pac: Are you doin HL?

BlindedByGInge

.:FuZion:. wrote: »

Haha Yeah im doin mine to, but I rarely need to use the -B formula. :pac: Are you doin HL?

Yup HL, luckily im gud enough at it, -B's here there everywhere for us, applied maths is the real difficult one tbh. Haha, i see u from carrigaline, only 10 min for my gaff!!

.:FuZion:.

BlindedByGInge wrote: »

Yup HL, luckily im gud enough at it, -B's here there everywhere for us, applied maths is the real difficult one tbh. Haha, i see u from carrigaline, only 10 min for my gaff!!

Cool me 2. Just finishing the course with Further Calculus now I like maths haha. Yeah I am! Great place :pac: Where do you live? :cool:

MathsManiac

Just in case you're interested: if the coefficient of x^2 is 1 and the coefficient of x is an even number, then completing the square is a quick way to solve a quadratic:

x^2 - 4x +1 = 0
(x-2)^2 - 3 = 0
x = 2 (+/-) sqrt(3).

Of course, the technique works in general. It's just that under the condition specified above, it happens to be quick and easy.

Gael23

BlindedByGInge wrote: »

No i think its, -b= 4+/-
√12

---

2

Im lost here, doesnt this give you 6?

We

ryanf1 wrote: »

BlindedByGInge wrote: »

No i think its, -b= 4+/-
√12

---

2

Im lost here, doesnt this give you 6?

no your definitely wrong on this one.. √12 becomes √4√3 ie. 2√3 ...

then you have 4+/- 2√3

the 4 and 2 cancels with denominator and your left with 2+/- √3