The degree is equal to the highest exponent on a variable, which is 2.
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x3 + x2 - 6x + 4 = (x - 1)(x2 + 2x - 4)
x2 + 4x + 6 can not be factored. If you want, you can reduce it to an expression with a single x term by comleting the square: x2 + 4x + 6 = x2 + 4x + 4 + 2 = (x + 2)2 + 2
The numerical coefficient of it is 2 .
(x2+3x-4) (x-4)
x + 4