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finding the value of x

2x²= 72

find the value of x

someone please help its a gcse question :smile:

divide both sides by 2, then take the square root of both sides.

There's a separate forum for Maths:
http://www.thestudentroom.co.uk/forumdisplay.php?f=38

Reply 2

WildBerry

As above, and dont forget about the negative value of x when you square root.

Reply 3

Mr M

Study Forum Helper

Original post by WildBerry

As above, and dont forget about the negative value of x when you square root.

Although you are absolutely correct, failure to consider the negative value will not cost a mark at GCSE.

Reply 4

Mark85

Original post by Mr M

Although you are absolutely correct, failure to consider the negative value will not cost a mark at GCSE.

So at GCSE level, quadratic equations only have one root? What a farce. I am near sure that this wasn't the case when I did my GCSE 11 years ago.

Reply 5

Mr M

Study Forum Helper

Original post by Mark85

So at GCSE level, quadratic equations only have one root? What a farce. I am near sure that this wasn't the case when I did my GCSE 11 years ago.

They only insist on one root for

x^2 = k

but two roots for a three term quadratic which is admittedly a bit peculiar.

Reply 6

flipflap99

Original post by Mr M

Although you are absolutely correct, failure to consider the negative value will not cost a mark at GCSE.

Although you may be correct, id write plus minus 6 just to be safe.

Reply 7

Noble.

Original post by yoitsro

Although you may be correct, id write plus minus 6 just to be safe.

He is a teacher, they are never wrong!!!

Reply 8

Mr M

Study Forum Helper

Original post by yoitsro

Although you may be correct, id write plus minus 6 just to be safe.

Well, if it occurs to the OP to do so, that would obviously be the best course of action. The fact that they didn't know how to answer this question suggests that they might not remember.

Reply 9

davros

Original post by Mr M

They only insist on one root for

x^2 = k

but two roots for a three term quadratic which is admittedly a bit peculiar.

So is it any surprise to you that there are students on here who find the transition to A level a complete nightmare and have fundamental gaps in their algebraic manipulation skills??

Reply 10

Mr M

Study Forum Helper

Original post by davros

So is it any surprise to you that there are students on here who find the transition to A level a complete nightmare and have fundamental gaps in their algebraic manipulation skills??

Is that a rhetorical question?

Reply 11

davros

Original post by Mr M

Is that a rhetorical question?

Just being provocative to see what sort of response I'd elicit!

There's no need to answer :smile:

Reply 12

Nathan0012

Original post by Noble.

He is a teacher, they are never wrong!!!

I'm not saying this isn't true in this case, but I have met some teachers who are barely teachers and are often very wrong, it is not uncommon for a teacher to be wrong and make mistakes.

Reply 13

Felix Felicis

Original post by davros

So is it any surprise to you that there are students on here who find the transition to A level a complete nightmare and have fundamental gaps in their algebraic manipulation skills??

omg!!111 lissen up blud, it aint cos i aint got no gaps in ma skillz, its cuz a-level mathz is bare ard innit

(edited 11 years ago)

Reply 14

Noble.

Original post by Nathan0012

I'm not saying this isn't true in this case, but I have met some teachers who are barely teachers and are often very wrong, it is not uncommon for a teacher to be wrong and make mistakes.

It wasn't a serious comment. :smile:

Reply 15

Nathan0012

Original post by Noble.

It wasn't a serious comment. :smile:

That did occur to me just after I posted... It did sound a bit sarcastic. Although I think I have a valid point.

Reply 16

Nathan0012

Original post by Felix Felicis

omg!!111 lissen up blud, it aint cos i aint got no gaps in ma nolege, its cuz a-level mathz is bare ard innit

Thanks for making my day :biggrin:

Reply 17

davros

Original post by Felix Felicis

omg!!111 lissen up blud, it aint cos i aint got no gaps in ma skillz, its cuz a-level mathz is bare ard innit

dnt worry bro - as long as u cn name 3 thingz u wd do in an indian restaurant u will get da A* innit man

Reply 18

alisha28

Original post by confuzzled92

divide both sides by 2, then take the square root of both sides.

There's a separate forum for Maths:
http://www.thestudentroom.co.uk/forumdisplay.php?f=38

thank you for your help