8x3 is 2x cubed.
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x + x = 2x. Similarly, x^3 + x^3 = 2(x^3)
It is an expression which can be written in the form of: 2x3+x+3
The derivative of x3-2x+5 is 3x2- 2. This is its slope at a point x,y.
The quotient works out as: x^2+2x+4 and there is a remainder of -3
2(x^2 + 2)(x + 3)