exam Maths Puzzle Numerical Ability

hello i need help to simplify this
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| 18x^5
| -----
| y^2

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exam Other Question

I having trouble solving this equation
log (x+3)=1-log x Prove that if and B are square martices and AB is invertible, then both A and B are invertible.
i am not sure where to start. I know that because it is a proof you can't use an e