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solve (2 a - b) (18 a-9b-4)...

solve `(2 a - b) (18 a-9b-4)`

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`(2a-b)(18a-9b-4)`
=`(2a)(18a-9b-4)-b(18a-9b-4)`
= `36^2 - 18ab-8a-18ab+9b^2 +4b`=
`=1 36a^2-36ab+9b^2-8a+4b`.
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