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Question

$$(1.5x-4y)(1.5x+4y+3)-4.5x+12y$$.


Solution

$$=(1.5x-4y)(1.5x+4y+3)-4.5x+12y$$
$$=(1.5x)(1.5 x)+(1.5x)(4y)+(1.5x)(3)-(4y)(1.5 x)-(4y)(4y)-4y\times 3-4.5x+12y$$
$$=2.25 x^{2}+6xy+4.5x-6 xy-16 y^{2}-12y-4.5 x+12y$$
$$=2.25 x^{2}-16y^{2}$$

Mathematics

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