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Question

Question 3(vi)
Simplify:
(1.5x-4y)(1.5x+4y+3)-4.5x+12y

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Solution

(1.5x4y)(1.5x+4y+3)4.5x+12y
=1.5x(1.5x+4y+3)4y(1.5x+4y+3)4.5x+12y
=2.25x2+6.0xy+4.5x6.0xy16y212y4.5x+12y
=2.25x2+6.0xy6.0xy+4.5x4.5x16y212y+12y
=2.25x216y2


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