exam Maths Puzzle Numerical Ability

can you check this for me please?
3w^2+9w-1 and 8w^2-9w-4
8w^2+9w-4
=5

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exam Other Question

Instructions: Perform indicated operations.

What is the solution for -4x^2(5x^4-3x^2+x-2) Describe a situation that you can represent using the inequality x is greater or equal to 18. x>18