Given y=x2−x+2.
The equation of the tangent line at the point with abscissa 1 is ....
Explanation
To determine the equation of the tangent line, we need to find the gradient (m) and the tangent point first.
Determining the Gradient
The gradient is the first derivative of the curve function (y′).
y=x2−x+2
y′=2x−1
Substitute the abscissa x=1 into y′ to get the gradient.
m=y′(1)=2(1)−1=1
Determining the Tangent Point
We find the ordinate value (y) when the abscissa x=1.
y=(1)2−1+2
y=1−1+2=2
So, the tangent point is (1,2).
Determining the Equation of the Tangent Line
Use the formula for the equation of a tangent line y−y1=m(x−x1) with m=1 and point (1,2).
y−2=1(x−1)
y−2=x−1
y=x−1+2
y=x+1
So, the equation of the tangent line is y=x+1.