ITT we help examine to get 85 in his Maths extension 1 yearlies so he can do 4 unit (1 Viewer)

Examine

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Title says all, I'll be poasting questions and I hope you could help.

:)

You get cookies and stuff next study meat if you do.
 
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deswa1

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Re: ITT we help examine to get 85 in his Maths extension 1 yearlies so he can do 4 un

The instructions said you have to add "where he'll buy everyone a cookie". I'm not helping anymore...

Jokes- I'll do my best- post away
 

Carrotsticks

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Re: ITT we help examine to get 85 in his Maths extension 1 yearlies so he can do 4 un

No cookies.

No help.
 

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Re: ITT we help examine to get 85 in his Maths extension 1 yearlies so he can do 4 un

Can I still get cookies without helping
 

Carrotsticks

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Re: ITT we help examine to get 85 in his Maths extension 1 yearlies so he can do 4 un

Oh dear.
 

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Re: ITT we help examine to get 85 in his Maths extension 1 yearlies so he can do 4 un

Fine people get cookies if they help me at the next study meat
 

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Re: ITT we help examine to get 85 in his Maths extension 1 yearlies so he can do 4 un

and not the hungarian type
 

Carrotsticks

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Re: ITT we help examine to get 85 in his Maths extension 1 yearlies so he can do 4 un

And by 'cookies', you mean the 'biscuit', right?

Ask away.
 

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Re: ITT we help examine to get 85 in his Maths extension 1 yearlies so he can do 4 un

My first questions

Solve simultaneously

7/x-5/y=3 and 2/x+25/2y=12

and

9x^2+y^2=52 and xy=8
 

RealiseNothing

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Re: ITT we help examine to get 85 in his Maths extension 1 yearlies so he can do 4 un

My first questions

Solve simultaneously

7/x-5/y=3 and 2/x+25/2y=12

and

9x^2+y^2=52 and xy=8
For the second one, square the xy=8 to get (xy)^2 = 64. Then times the first equation by x^2 to get

Solve the resulting quadratic.
 

iBibah

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Re: ITT we help examine to get 85 in his Maths extension 1 yearlies so he can do 4 un

My first questions

Solve simultaneously

7/x-5/y=3 and 2/x+25/2y=12

and

9x^2+y^2=52 and xy=8
For the first one, make 5/y the subject for equation 1. Then sub into equation 2 because equation 2 is equal to 2/x+(5/2 x 5/y)=12. Solve for x then sub back in to equation 1 for y.

 
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Re: ITT we help examine to get 85 in his Maths extension 1 yearlies so he can do 4 un

For the second one, square the xy=8 to get (xy)^2 = 64. Then times the first equation by x^2 to get

Solve the resulting quadratic.
I've reached this part, problem is I don't know how to solve it after this.
 

iBibah

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Re: ITT we help examine to get 85 in his Maths extension 1 yearlies so he can do 4 un

I've reached this part, problem is I don't know how to solve it after this.
He showed that x^2y^2=64, so replace x^2y^2 with 64 to be left with the quadratic 9x^4-52x^2+64=0. Then solve that quadratic (it's a reducible quadratic, let u=x^2)
 

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Re: ITT we help examine to get 85 in his Maths extension 1 yearlies so he can do 4 un

He showed that x^2y^2=64, so replace x^2y^2 with 64 to be left with the quadratic 9x^4-52x^2+64=0. Then solve that quadratic (it's a reducible quadratic, let u=x^2)
Still not following (sorry if I'm being a pest)
 

Parvee

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Re: ITT we help examine to get 85 in his Maths extension 1 yearlies so he can do 4 un

Still not following (sorry if I'm being a pest)
9x^4-52^2+64=0
Letting u=x^2
9u^2-52u+64=0
and you can use your quadratic formula to find your u values
However u=x^2, solve for x
and sub into the original to find y
 

iBibah

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Re: ITT we help examine to get 85 in his Maths extension 1 yearlies so he can do 4 un



Now just solve for u, then replace u with x^2 and solve for x.
 

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Re: ITT we help examine to get 85 in his Maths extension 1 yearlies so he can do 4 un

Thanks so much guys!
 

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