(2x+3y)²-(4x-9y)(4x+9y)+(2x-3y)²
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![(2x+3y)²-(4x-9y)(4x+9y)+(2x-3y)²](/uploads/image/z/3932495-71-5.jpg?t=%EF%BC%882x%2B3y%EF%BC%89%26sup2%3B-%EF%BC%884x-9y%EF%BC%89%EF%BC%884x%2B9y%EF%BC%89%2B%EF%BC%882x-3y%EF%BC%89%26sup2%3B)
(2x+3y)²-(4x-9y)(4x+9y)+(2x-3y)²
(2x+3y)²-(4x-9y)(4x+9y)+(2x-3y)²
(2x+3y)²-(4x-9y)(4x+9y)+(2x-3y)²
(2x+3y)²-(4x-9y)(4x+9y)+(2x-3y)²
=(2x+3y)²-(4x-9y)(4x+9y)+(2x-3y)²
=2(4x²+9y²)-(16x²-81y²)
=8x²+18y²-16x²+81y²
=99y²-8x²