That's correct (as MrM says, it gives a better impression if you use the term "multiply" rather than "times", but you have the right idea now!)

BTW if you click the Reply button at the bottom of a post when you respond to someone's post it will actually quote what that person said so they will know that you have replied to them :smile:

Reply 44

Mr M

Study Forum Helper

20

Original post by Kallisto

Seriously?! to get out what a value x has, the only one what you have to do is to multiply by 9 on both sides of the equation...

Fliss is new to algebra.

Reply 45

Kallisto

Entertainment Forum Helper

22

Original post by Mr M

Fliss is new to algebra.

Really? I didn't know it!

Can you read me, fliss1992? I want to explain you the most important rules in algebra as good as I can!

to solve a subtraction in algebra, you have to add on each side of the equation. Example: x - 2 = 3 => x = 5 after adding by 2

to solve an addition in algebra, you have to subtract on each side of the equation. Example: x + 7 = 14 => x = 7 after subtracting by 7

to solve a multiplication in algebra, you have to divide on each side of the equation. Example: x * 3 = 27 => x = 9 after dividing by 3

to solve a division in algebra, you have to multiply on each side of the equation. Example: x/5 = 50 => x = 250 after multiplying by 5

Reply 46

lmorgan95

8

Original post by Mr M

People who attend Eton often go on to great success. The evidence is there if you look for it.

that's what happens when mummy and daddy can spend £40000 a year on their kids education i suppose :rolleyes:

Original post by lmorgan95

that's what happens when mummy and daddy can spend £40000 a year on their kids education i suppose :rolleyes:

That hadn't occurred to me. I assumed it was entirely due to the geography.

Reply 48

lmorgan95

8

Original post by Mr M

That hadn't occurred to me. I assumed it was entirely due to the geography.

Nooo haha there's quite a stigma attached to eton in particular, there's a reason it churns out so many politicians and it's definitely not just because of it's location :tongue:

Original post by lmorgan95

Nooo haha there's quite a stigma attached to eton in particular, there's a reason it churns out so many politicians and it's definitely not just because of it's location :tongue:

Thanks for the explanation. I feel much better informed now.

Reply 50

TenOfThem

18

Original post by Mr M

Thanks for the explanation. I feel much better informed now.

behave

Original post by TenOfThem

behave

Yes Miss.

Reply 52

fliss1992

OP

2

Even though a lot of you have decided to go way of topic, thanks to all those who have helped :smile:

Original post by fliss1992

Even though a lot of you have decided to go way of topic, thanks to all those who have helped :smile:

That's me told off.

:frown:

Reply 54

fliss1992

OP

2

Lol not telling anyone off :smile:

Reply 55

fliss1992

OP

2

Here I have a question..

72
______ = 1

x^2 - 9

I'm guessing here ^^ that because it says subtract I need to do the opposite and do addition.

However, where do I begin on this one?

I have done several examples of the previous question, and managed to tackle it.

Original post by fliss1992

Here I have a question..

72
______ = 1

x^2 - 9

I'm guessing here ^^ that because it says subtract I need to do the opposite and do addition.

However, where do I begin on this one?

I have done several examples of the previous question, and managed to tackle it.

Division takes priority over subtraction and the opposite of division is multiplication.

You really shouldn't be trying to solve quadratic equations (even if they are as simple as this one) at this stage in your mathematical education.

Reply 57

davros

16

Original post by fliss1992

Here I have a question..

72
______ = 1

x^2 - 9

I'm guessing here ^^ that because it says subtract I need to do the opposite and do addition.

However, where do I begin on this one?

I have done several examples of the previous question, and managed to tackle it.

Is this

\displaystyle \dfrac{72}{x^2 - 9} = 1

In this case, there are several things going on:
the x is squared
9 is subtracted from that result
72 is divided by the result of the previous step

and this final result must be equal to 1.

When you see a complicated equation like this with a fraction involved, your first step is almost always to clear the fraction by multiplying by the denominator. What do you get if you do that?