exam Maths Puzzle Numerical Ability

I need help and this not from text book 3X^2 - 3X - 60. I get 3x(3-20) Thank you

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exam Other Question

The length of a room is 4 metres longer than its width. The height of the room
is 3 metres and its volume is 1000m3. Find the length and width of the room. 15 + 2 log2^x =31