pls answer my question no.2
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2.25 x^2 -16y^2
we can break (1.5x-4y) ( 1.5x+4y+3)
into (1.5x -4y)(1.5x+4y) +(1.5x -4y)×3 [distributive property]
So (1.5x -4y)(1.5x+4y) = 2.25 x^2 - 16y^2
[a^2-b^2 =( a-b ) (a+b) ]
and (1.5 x -4 y) × 3 = 4.5 x - 12y
so (1.5x-4y) ( 1.5x+4y+3) - 4.5x +12 y =
2.25 x^2 - 16y^2 + 4.5 x -12y -4.5 x + 12y
= 2.25 x^2 - 16y^2
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