# Thread: Need help working out equations....by tomorrow

1. ## Need help working out equations....by tomorrow

Is anybody able to help me with Q3c (Maths in Action, 2nd page)?

It is: Calculate the magnitude of the current I when a voltage of 100 V is applied across a resistance R of 10^12 (Ohms law).

Thanks,
Ash ~

2. This is basic algebra, if you're at uni you should already know this stuff.

You have got the wrong end of the stick on question 3. The question is asking you to reduce the surd to it's simplest form by using the rules $\sqrt{ab} = \sqrt{a} \cdot \sqrt{b}$ and $\sqrt{a^2} = a$ (where $a$ and $b$ are both positive)

You can use prime factors to solve this.

For example $\sqrt{8} = \sqrt{2^3} = \sqrt{2 \cdot 2^2}$

Use the above rules to simplify.

3. The maths I am doing at uni is basic maths for beginners, for people who do not have much of a maths background. My lecturer just gives the answers and does not show us how to do it for ourselves, and this is why I am struggling.