exam Maths Puzzle Numerical Ability

Please help me multiply the following.

8pq^2(2pq - 3p +5q)

Thank you for helping me out.

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exam Other Question

2x-y-z=-3
x-2y+3z=6
x+y+z=6
use matrices to solve thank you
The 4th root of 3s^2t^4 (numerator)
10,000 (denominator)

Please help! I don't get this root stuff!