That factors to (x + 3)(x^2 - 3x + 7)
Setting those equal to zero leaves one real root (-3) and one complex root: one half times (three minus i times the square root of 19) where i is the square root of negative one.
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The expression in the question "y -2x" is not a function.
For example, the derivate of x2 is 2x; then, an antiderivative of 2x is x2. That is to say, you need to find a function whose derivative is the given function. The antiderivative is also known as the indifinite integral. If you can find an antiderivative for a function, it is fairly easy to find the area under the curve of the original function - i.e., the definite integral.
The [ 2x + 1 ] represents a function of 'y' .
It is: 2x^2 -x -21
3