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I take this to be 3x3 - 21x2 + 36x.

I notice that 3x is a factor common to all three terms. Let me remove that first.

3x ( x2 - 7x + 12 )

"By inspection" I can make up the two factors in the parenthesised part.

3x ( x - 4 ) ( x - 3 )

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11y ago

What else can I help you with?