Find a general expression for the slope of a tangent line to the indicated curve. Then find the slopes for the given values of x. Sketch the curves and tangent lines. y = x2 + 3x + 37; X = - 3.5, x = 3 . . . What is the general expression for the slope of a line tangent to the curve of the function y = x2 + 3x + 3xt at the point P(x,y)? mtan = (Simplify your answer.) The slope at x = - 3.5 is . (Simplify your answer.) The slope at x = 3 is (Simplify your answer.)