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###### Advanced difference of two squares

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3 months ago

I hate apple my account doesn’t let me post pics so I am using the app version

Original post by Mad Man

The images the bottom question is the one I’m stuck on

Image hasnt loaded properly.

I can’t seem to upload the question and my working so I’ll type it

[(2x+y)(y-2x)]^2-(4x^2+y^2+2z^2)^2

I noticed it was dots and I expanded the first bracket twice and the second once.

Is there a quicker way of doing this and will it come up in the exam. I think this is very tedious

Ps can someone help me upload images on tar iOS because it asks me to use a link but when I had my android I could take a pic and show it

[(2x+y)(y-2x)]^2-(4x^2+y^2+2z^2)^2

I noticed it was dots and I expanded the first bracket twice and the second once.

Is there a quicker way of doing this and will it come up in the exam. I think this is very tedious

Ps can someone help me upload images on tar iOS because it asks me to use a link but when I had my android I could take a pic and show it

Original post by Mad Man

I can’t seem to upload the question and my working so I’ll type it

[(2x+y)(y-2x)]^2-(4x^2+y^2+2z^2)^2

I noticed it was dots and I expanded the first bracket twice and the second once.

Is there a quicker way of doing this and will it come up in the exam. I think this is very tedious

Ps can someone help me upload images on tar iOS because it asks me to use a link but when I had my android I could take a pic and show it

[(2x+y)(y-2x)]^2-(4x^2+y^2+2z^2)^2

I noticed it was dots and I expanded the first bracket twice and the second once.

Is there a quicker way of doing this and will it come up in the exam. I think this is very tedious

Ps can someone help me upload images on tar iOS because it asks me to use a link but when I had my android I could take a pic and show it

The first bracket gives

(y^2-4x^2)^2

Then its simply doing dots as usual so

(sum)(difference)

and you pretty much write down the answer. Should be two (at most three) simple lines.

Theres the "new tsr" thread for reporting problems with it.

(edited 3 months ago)

Original post by mqb2766

The first bracket gives

(y^2-4x^2)^2

Then its simply doing dots as usual so

(sum)(difference)

and you pretty much write down the answer. Should be two (at most three) simple lines.

Theres the "new tsr" thread for reporting problems with it.

(y^2-4x^2)^2

Then its simply doing dots as usual so

(sum)(difference)

and you pretty much write down the answer. Should be two (at most three) simple lines.

Theres the "new tsr" thread for reporting problems with it.

I still don’t get it can you show me?

It’s not homework it’s from the cgp textbook

Original post by Mad Man

I still don’t get it can you show me?

It’s not homework it’s from the cgp textbook

It’s not homework it’s from the cgp textbook

Dots is

a^2 - b^2 = (a+b)(a-b)

so here a=(y^2-4x^2) and b=(4x^2+y^2+2z^2). So ...

Obv in a+b the 4x^2 term disappears and in the a-b, the y^2 term disappears.

Original post by mqb2766

Dots is

a^2 - b^2 = (a+b)(a-b)

so here a=(y^2-4x^2) and b=(4x^2+y^2+2z^2). So ...

Obv in a+b the 4x^2 term disappears and in the a-b, the y^2 term disappears.

a^2 - b^2 = (a+b)(a-b)

so here a=(y^2-4x^2) and b=(4x^2+y^2+2z^2). So ...

Obv in a+b the 4x^2 term disappears and in the a-b, the y^2 term disappears.

Your explanation is so much better than the book it factorises and does unnecessary steps but I get it now. TY

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