simplify:(1.5x-4y)(1.5x+4y+3)-4.5x+12y
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(1.5x−4y)(1.5x+4y+3)−4.5x+12y
=(1.5x)(1.5x)+(1.5x)(4y)+(1.5x)(3)−(4y)(1.5x)−(4y)(4y)−4y×3−4.5x+12y
=2.25x 2 +6xy+4.5x−6xy−16y 2−12y−4.5x+12y
=2.25x 2 −16y 2
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