(x-3y)(4x+3y)-(2x-3y)^2
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(x-3y)(4x+3y)-(2x-3y)^2(x-3y)(4x+3y)-(2x-3y)^2(x-3y)(4x+3y)-(2x-3y)^2(x-3y)(4x+3y)-(2x-3y)²=4x&
(x-3y)(4x+3y)-(2x-3y)^2
(x-3y)(4x+3y)-(2x-3y)^2
(x-3y)(4x+3y)-(2x-3y)^2
(x-3y)(4x+3y)-(2x-3y)²
=4x²+3xy-12xy-9y²-2x²-6xy+3y²
=2x²-15xy-6y²
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=4x^2-9xy-3y^2-(4x^2-12xy+9y^2)
=-12y^2-3xy
(x--3y)(4x+3y)--(2x--3y)^2
=4x^2--12xy+3xy--9y^2--4x^2+12xy--9y^2
=3xy--18y^2.
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