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To expand brackets you should multiply each term with every other term. Here it would be: 3a²-3a+4a-4 Collecting the a terms, this simplifies to: 3a²+a-4.

The "future simple" tense is used when one wants to describe an action that will take place sometime in the future. In English, we use "will" or "shall" + a main verb, for eg...

• When the action potential reaches the pre-synaptic knob, voltage gated Ca²⁺ channels open which allows Ca²⁺ into the pre-synaptic knob - This causes vesicles which contain neur...

Since the key word is contrast infomation about both facilitated diffusion and active transport is needed.

Facilitated diffusion does not require ATP whereas active transport does ...

BODMAS is an acronym that tells you what order to do things in a maths equation. It stands for brackets, order (e.g. 2²), division/multiplication and addition/subtraction.