exam Maths Puzzle Numerical Ability

what are the roots of the equation 2x^2-5=0.

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exam Other Question

The area of the triangle is 100a^3b square units. Find the height of the triangle.
The length is 20a^2 Two planes leave Chicago - one travelling due east and the other due west. The first travels 100 miles per hour faster than the second. How long will it be until they are 2000 miles apart? (I put no solution found)