-3x^2+4y^2-(5x^2-7y^2-1)

now i came up with the answer of 32

Question

-3x^2+4y^2-(5x^2-7y^2-1)

now i came up with the answer of 32

angela210793 · Answer

-3x^2+4y^2-(5x^2-7y^2-1)=-3^2+4y^2-5x^2+7y^2+1=-8x^2+11y^2+1

angela210793 · Answer

How did you get 32? O.o

anonymous · Answer

-3x^2+5x^2 (4y^2-7y^2

angela210793 · Answer

no u don't multiply them...u just add and subtract those just as with natural no.s

angela210793 · Answer

Bella is it minus before the bracket?>

anonymous · Answer

yes thats what it looks like

anonymous · Answer

$$11y^2-8x^2+1$$

angela210793 · Answer

then u don't have to multiply anything 
-3-5=-8 right? (integers) u don't have these u have -3x^2=5x^2=-8x^2

anonymous · Answer

yes its definitaly minus

angela210793 · Answer

so it's =-8x^2+11y^2+1

anonymous · Answer

now these are to the 2nd power i couldn't figure out how to type it in

angela210793 · Answer

write it by using the blue button below ''equation''

anonymous · Answer

Yes it's $$11y^2-8x^2+1$$ because $$(-3x^2-5x^2)(+4y^2+7y^2)+1$$Then rearrange so the highest coefficient is to the left giving the above

anonymous · Answer

The trick is to change the sign of all the terms in the bracket when removing them thus the terms in the bracket become:$$-5x^2+7y^2+1$$

anonymous · Answer

thanks angela i never thought about using that

angela210793 · Answer

Lol :P:P

anonymous · Answer

okay Kevsturge this makes sense

anonymous · Answer

so the answer is 25 then and not 32

anonymous · Answer

how did you get 25?

angela210793 · Answer

Bella can u pls write the problem as it is written in ur book?
this way we may help u better :)

anonymous · Answer

okay i am lost am adding here or subtracting

anonymous · Answer

okay one minute

anonymous · Answer

Ah, I am missing something lol

anonymous · Answer

$$-3^2+4y ^2-(5^2-7y ^{2}-1)$$

anonymous · Answer

3x sory

anonymous · Answer

and 5x

anonymous · Answer

Sure does this equal 0 or something otherwise I cannot get an answer to this other than to collect the terms.

anonymous · Answer

i am starting to wonder the same thing

anonymous · Answer

Does the question say solve for x or y or something else?

angela210793 · Answer

so then it's the same answer we gave u if it is...$$-3x^2+4y^2-(5x^2-7y^2-1)=-3x^2+4y^2-5x^2+7y^2+1=-8x^2+11y^2+1$$

anonymous · Answer

sorry got to go, will be back later..

angela210793 · Answer

bye :)

anonymous · Answer

omg its after 2pm i have been so caught up thks guys i have to get ready for work i will be back later man

anonymous · Answer

tks Angela i couldn't have figured this one out

angela210793 · Answer

You're welcome :):)
Have a gr8 day :):)

anonymous · Answer

will you be on later tonight

angela210793 · Answer

I don't think so...I have to study conics :(:(:(
I'm very behind :(:( Sorry....other ppl will help you :):)

anonymous · Answer

okay tks have a bless one

angela210793 · Answer

u 2 :)