(x2-y2)-4(2x2-3y)
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(x2-y2)-4(2x2-3y)(x2-y2)-4(2x2-3y)(x2-y2)-4(2x2-3y)=x²-y²-8x²+12y=-7x²-y²+1
(x2-y2)-4(2x2-3y)
(x2-y2)-4(2x2-3y)
(x2-y2)-4(2x2-3y)
=x²-y²-8x²+12y
=-7x²-y²+12y
(x²-y²)-4(2x²-3y)=x²-y²-8x²+12y=-7x²-y²+12y