exam Maths Puzzle Numerical Ability

Solve by completing the square :

-7x = 5 - x^2

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exam Other Question

Can you help me divide and simplify:

18x^2+17+4/8x-12 divided by 9x^2+4x/24x-36 help me to simplify

3x^2m^5(2x^4m^2) / 3x^2m^5m^-4