Differentiation: Exercise 1 – Calculus Methods

by Batool Akmal
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00:01 Welcome back.

00:02 I've hope you've enjoyed having a go on the questions and the exercises.

00:06 We're now just going to go through it together to see whether you've done it correct or incorrectly.

00:11 And also to see if there is any problems that you've had so that we can help you out with them.

00:17 So looking at our first question.

00:19 Nice and straight forward.

00:21 Find the general gradient of the curve.

00:27 It's just the gradient as a function.

00:29 You don't need to substitute any numbers into it.

00:32 You don't need to find any tangents or normals.

00:34 You just have to find the gradient as an expression.

00:37 So let's have a look at this equation we've got y = root x + 2x - 1.

00:42 Now recall what we said if we had any root x's or any powers, any indices that are down as denominators, we can bring them up using rule of indices.

00:53 But in this case all we have to do is change the square root.

00:56 So we can rewrite this as y = x to the half.

01:02 Plus 2x minus 1.

01:06 And the general gradient dy by dx.

01:08 Bring the power down.

01:12 Decrease the power by 1.

01:14 Same again.

01:16 Bring the power down.

01:18 Which is just 1, 2x, 1 - 1 and the constant just disappears.

01:24 So the answer to this will be the half x to the minus the half plus 2.

01:31 Because x to the 0 is just going to be 1.

01:34 And again you can take that down.

01:37 So 2x to the half plus 2.

01:40 Or you could rewrite this as a root to see we write this as 1 over 2 root x plus 2.

01:50 Which means to find a particular gradient you just have to replace this x with different values or different points in the curve that you are looking at.

The lecture Differentiation: Exercise 1 – Calculus Methods by Batool Akmal is from the course Calculus Methods: Differentiation.

Included Quiz Questions

1. y=x^(-1/2)
2. y=x^(1/2)
3. y=x^(-1)
4. y=x^(-2)
5. y=x^(2)
1. dy/dx=(-1/2)x^(-3/2)
2. dy/dx=(-1/2)x^(1/2)
3. dy/dx=(-1/2)x^(-1/2)
4. dy/dx=(1/2)x^(-3/2)
5. dy/dx=(-1/2)x^(3/2)

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