(3x-y)(y+3x)-(4x-3y)(4x+3y)=?

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(3x-y)(y+3x)-(4x-3y)(4x+3y)=?(3x-y)(y+3x)-(4x-3y)(4x+3y)=?(3x-y)(y+3x)-(4x-3y)(4x+3y)=?(3X-Y)(Y+3X)-

(3x-y)(y+3x)-(4x-3y)(4x+3y)=?
(3x-y)(y+3x)-(4x-3y)(4x+3y)=?

(3x-y)(y+3x)-(4x-3y)(4x+3y)=?
(3X-Y)(Y+3X)-(4X-3Y)(4X+3Y)
=[(3X)^2-Y^2]-[(4X)^2-(3Y)^2]
=(9X^2-Y^2)-(16X^2-9Y^2)
=8Y²-7X²