I'm assuming that is 2x squared, and not 2 multiplied by 2, as a given question usually wouldn't come in such a silly format. I do wish people would start using (2x^2) or (2x²), though.
Just substitute the value of x (-3) in to the equation to find the value of y, or P(x).
2(-3)² + 7(-3) - 1 = -4
