I see that you have over ten postings.
By now you should understand that this is not a homework service
So you need to either post some of your work on a problem or explain what you do not understand about the question.
Find the coordinates of the points on the curve y = 2x³ - 3x² - 13x +2 at which the tangents to the curve make angles of 135* with the positive sense of the x axis.
edit: I can differentiate the first part and get the slope, 6x² - 6x -13 and solve for x, but I don't get what I am supposed to do with the 135* angle part, I get that the x will be positive but do I just solve for x . Could someone explain the 135* angle part?
One of the first things you should have learned about "slope" is that the slope of a line is the tangent of the angle the line makes with the x-axis. If the line makes an angle of 135 degrees, then the slope is tan(135). 135 is, by the way, 90+ 45 so you should not have to use a calculator.