exam Maths Puzzle Numerical Ability

Solve by completing the square:

w(6w+5)=4

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exam Other Question

16(3b-0.25) Subtract.

4x-2x squared +4x to the 3rd power FROM
4x to the 3rd power + x - 3x squared

I have no clue how to complete this problem. Can you please help me? Thank You!!