With what integer a is the the graph y=4x-2 the tangent line of y=ax^2+28x+14?
1 Answer
Dec 17, 2017
Explanation:
The given equations will have the same y value at point of tangency, therefore, we may set the right sides of both equation equal:
The slope of the tangent is 4, therefore, we must set the first derivative of the quadratic equal to 4:
The substitute equation [2] into equation [1]: