exam Maths Puzzle Numerical Ability

Solve the quadratic equation by completing the square:
2x^2 + 10x + 11 = 0

Can someone please explain to me the idea behind the quadratic equation, thank you

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exam Other Question

Could I please get some help with the sum of the arithmetic equation? I can not seem to transfer the correct symbols to this email, so I hope someone can under stand.

Sum Symbo 2/x-2+5/x+2=-6x/x^2 -4