exam Maths Puzzle Numerical Ability

Please help me solve this equation:
(x^2)+(sqrt22)(x)=0

Thank you!

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exam Other Question

A rectangular box is (3x + 7) feet wide, (6x + 3) feet long, and (7x - 1) feet high. Find the volume of this box. ok here is my problem

6x+3=2x+11

now what do i do with it. ive tried everything and cant seem to get the right answer. Plz help