# AP Calculus AB : Slope of a curve at a point

## Example Questions

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### Example Question #1 : Slope Of A Curve At A Point

Find the slope of the curve  at the point with x-coordinate .

Explanation:

To find the slope at a point, we take the derivative of , substitute in , and simplify.

.

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### Example Question #1 : Slope Of A Curve At A Point

Find the slope of at t=0.

Explanation:

First, use the chain rule to find f'(t).

You should get .

Next, plug in t=0 to get f'(0)=.

### Example Question #1 : Slope Of A Curve At A Point

Find the slope of the curve , at .

Explanation:

Find the derivative of the curve using the power rule.

In mathematical terms, the power rule states,

Therefore the derivative is,

Next, plug in the x-value to find the slope of the curve at , which gives you a final answer of

### Example Question #11 : Derivative At A Point

Find the slope of the curve, , at .

Explanation:

Expand the binomial and combine like terms to get,

Next, take the derivative of the polynomial using the power rule, which is in mathematical terms,

Therefore,

Lastly, plug in  for , to get the slope at the point.

### Example Question #1 : Slope Of A Curve At A Point

Find the slope at the point (1,2) of the function

Explanation:

Derivatives are slope finders. Therefore to find the slope at the given point, we need to find the derivative of the function using power rule. Power rule says that we take the exponent of the “x” value and bring it to the front. Then we subtract one from the exponent.

So, we get

From there we plug in our x value.

### Example Question #7 : Slope Of A Curve At A Point

Find the slope of the function  at the point

Explanation:

To find the slope at a point of our function, we need to find its derivative first.

Using the product rule (and the chain rule within this product rule application), we have

.

Plugging the -value of our point into this equation, we get our desired slope of

.

### Example Question #1 : Slope Of A Curve At A Point

If , what is the slope of the curve at the point ?

Explanation:

To find the slope at a point, we first find the derivative of our function, and then substitute in the -value of our point.

, so , and plugging in our -value gives .

### Example Question #9 : Slope Of A Curve At A Point

Find the rate of change of f(x) at the point (4,12).

Explanation:

Find the rate of change of f(x) at the point (4,12)

We are asked to find a rate of change, so begin by finding the first derivative.

Now, we need the rate of change at (4,12). What matters most is the x value, simply plug it into our derivative and solve for y

### Example Question #10 : Slope Of A Curve At A Point

Find the slope of the line tangent to f(x) at the point x=0.

Explanation:

Find the slope of the line tangent to f(x) at the point x=0

To find the slope of a tangent line, we must first find the derivative of our function.

Let's recall a few rules to help us out.

1) The derivative of a monomial can be found by multiplying the coefficient by the exponent, and then decreasing the exponent by 1.

2) The derivative of e to the x is e to the x

3) The derivative of cosine is negative sine

Now, put it all together to get:

Lastly, we need to plug in 0 for x and solve our equation.