Symbolab Blog: High School Math Solutions – Derivative ...
blog.symbolab.comFeb 05, 2017 · Plug in the value for x into the derivative ; 4. Use the point-slope formula to find the equation of the tangent line. y-y_1=m(x-x_1) Get (x_1, y_1) from Step 1 and get m from Step 3; We’ll now go over some examples. First example : Find the tangent line of \f(x)=\sqrt{x^2+1} at x=-1 1. Find the tangent point