Find a general expression for the slope of a tangent line to the indicated curve. Then nd the slopes for the given values of x. Sketch the curves and tangent lines. y=x2+3.5x+31t:x= -4,x=2 E) What is the general expression for the slope of a line tangent to the curve of the function y = X2 + 3.5x + Sat at the point P(x,y)? mtan = D (Simplify your answer.)