factorise (3x+8y)(x-4y)-(x-4y)^2

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1 Answer

1...(3x+8y)*(x-4y)=3x^2 -4xy -24y^2

2...(x-4y)^2=x^2 -8xy+16y^2

1-2...2x^2 +4xy -40y^2

or 2*(x^2 +4xy -20y^2)

2*(x-2.8989795)*(y+6.8989795)
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