anonymous
  • anonymous
what is dis 4x^-9y^
Algebra
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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jdoe0001
  • jdoe0001
I wonder that myself, can you take a quick screenshot of the material?
anonymous
  • anonymous
i meant how do i solve dis because i dont know LOLLLL!!!!
jdoe0001
  • jdoe0001
ahemm, well, you see, we dunno what you have, what you typed in looks like \(\huge 4x^{-9y} \)

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anonymous
  • anonymous
ohhhh it's 4x to the 2nd power minus 9y to the 2nd power
jdoe0001
  • jdoe0001
\(\huge 4x^2-9y^2 ?\)
anonymous
  • anonymous
yes
jdoe0001
  • jdoe0001
http://www.mathexpression.com/image-files/diff-of-squares.png
jdoe0001
  • jdoe0001
pay close attention to "4" and "9"
anonymous
  • anonymous
alright
anonymous
  • anonymous
is this right (4x-9y)(X+Y)
jdoe0001
  • jdoe0001
well
jdoe0001
  • jdoe0001
if you check \(4 = 2^2\) and \(9 = 3^2\)
jdoe0001
  • jdoe0001
$$ \large 4x^2-9y^2 \implies (2x)^2-(3y)^2\\ (a^2-b^2) = (a-b)(a+b) $$
anonymous
  • anonymous
so it's (2x-3y)2nd power
jdoe0001
  • jdoe0001
well, no quite
jdoe0001
  • jdoe0001
\((2x-3y)^2 = (2x-3y)(2x-3y)\)
jdoe0001
  • jdoe0001
same * same, \(same^2\)
jdoe0001
  • jdoe0001
$$ \large 4x^2-9y^2 \implies (2x)^2-(3y)^2\\ (a^2-b^2) = (a-b)(a+b) $$

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