It's a number that is exactly 3 greater than
whatever the value of 'x' is at that moment.
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X 3 plus x-142 plus x is an equation equal to x3+2x-142.
x2 + 4x + 3 =(x + 3) (x + 1)
x^3 + ax + 3a + 3x^2 = (x^3 + 3x^2) + (ax + 3a) = x^2(x + 3) + a(x + 3) = (x + 3)(x^2 + a)
It is an expression which can be written in the form of: 2x3+x+3
3x + 11 = x + 3 2x = -8 x = -4