3x2 if it is in parentheses
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-3x2+10x-3 -(3x2-10x+3) -(3x-1)(x-3)
First you should take out the common factor. After you do that, in this case you have a difference of square, so you can use the formula for a difference of squares.
I guess that should be 3 times (x squared) minus 48: 3x2 - 48 = 3(x2 - 16) = 3(x + 4)(x - 4)
-6to work it out: remember BIDMASso 3x2=6! then 6-12=-6
If the original is 2x + 3x2 + 6 + 5x3, you should rearrange the terms in order of exponent:5x3 + 3x2 + 2x + 6