Answer:
The unit vectors are:
Step-by-step explanation:
Unit vectors that are a parallel to the tangent line have the same slope than the tangent line, thus we can find the slope of the tangent line, find directional vectors and then their corresponding unit vectors.
Finding the slope of the tangent line.
We can find the first derivative of the curve, which represents the slope of the tangent line of the curve at that point.
At x = 2 we have
Thus we have slope m = 4, then the parallel unit vector has slope m = 4/1
Finding unit vectors.
From the slope m = 4/1, we can write it as a direction vector with x =1 and y = 4. Notice also that x = -1 and y = -4 would have given as as well slope m = 4 too.
Then in order to find the unit vector on that direction we can use the formula
So finding the magnitude we get
Then one unit vector that is parallel to the tangent line is
And the second unit vector is
The negative sign on both x and y components just tell us that we are aiming on the opposite direction as the first unit vector, yet both have the same value of the slope.