calculate the slope of a line tangent to the curve of the function y=f(x)=5x2 at the point P(3,45)

calculate the slope of a line tangent to y=2x2+5x at P(5,25).

Find the general expression for the slope of a line tangent to the curve of y=x2+4x at the point P(x,y). Then find the slopes for x=2 and x=1.5. Sketch the curve and the tangent lines.