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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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10y ago
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Q: What is 3x 3-21x 2 plus 36x in factored form?
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