To find the equation of the tangent line to the curve at the given point (2, 6), we need to follow these steps:
- Calculate the derivative of the function:
The function is given as:
y = x³ + 2x + 2
The derivative of this function, which represents the slope of the tangent line at any point, is calculated using the power rule:
dy/dx = 3x² + 2
- Evaluate the derivative at x = 2:
Next, plug in x = 2
into the derivative to find the slope of the tangent line at that point:
dy/dx = 3(2)² + 2 = 3(4) + 2 = 12 + 2 = 14
So, the slope of the tangent line at the point (2, 6) is 14
.
- Use the point-slope form of the equation of a line:
The point-slope form of the equation of a line is given by:
y - y₁ = m(x - x₁)
Where (x₁, y₁)
is the point on the line, and m
is the slope.
Plugging in our values: (x₁, y₁) = (2, 6)
and m = 14
, we get:
y - 6 = 14(x - 2)
- Simplify the equation:
Now, distribute and solve for y
:
y - 6 = 14x - 28
y = 14x - 28 + 6
y = 14x - 22
Final Result: The equation of the tangent line to the curve at the point (2, 6) is:
y = 14x - 22