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In this video we’re going to look at how to simplify algebraic expressions. Before we get started on simplifying, a few things to remember:
(1) we always use a use a curly x for the letter x in algebra.
(2) We don’t really use the multiplication sign. 3a is how we write 3 X a.
(3) Instead of using the division sign, we use fractions.
3 divided by 2 is written as 3/2. In algebra we are often asked to simplify something, or to put it in its simplest form. Generally speaking, the simpler it is, the easier it is to use. We just need to combine like terms. Simplify fully 5a - 2b + 3a + 2 + 4b - 7. We combine the a’s to get 8a, and we combine the b’s (including the sign in front of each term) to get 2b. And finally we combine the numbers to get -5. Answer: 8a + 2b - 5. We cannot combine different letters so that is the simplest form. This expression may represent 8 apples and 2 bananas, which are different things so cannot be added together. For division, you can cancel numbers exactly as you would with fractions. And also you can also cancel down letters.
So if you have a to the power of 5 in the numerator and a to the power of 3 in the denominator, we can cancel these down to end up with a to the power of 2 in the numerator and no a's left in the denominator. We can also simplify by factoring into brackets or by expanding brackets - which are skills we will look at in other videos.
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Plants have developed responses called tropisms. A tropism is a growth in response to a stimulus; so light and water in the plant’s case.
There are different types of tropisms: Positive tropisms are when growth is towards the stimulus - so the plant growing towards the light to maximise the stimul

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CREDITS
Animation & Design: Waldi Apollis
Narration: Dale Bennett
Script: Lucy Billings
Look at these baby animals. You will have immediately observed how cute and fluffy they are but you will
also have noticed that they are different -

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Enzymes are really important proteins, that speed up the rates of reactions such as in photosynthesis, respiration and protein synthesis.
The enzymes and substrates are always moving, and occasionally they collide at the right speed and