exam Maths Puzzle Numerical Ability

Solve by completing the square.
x2 - 2x - 15 = 0

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exam Other Question

[(8+5)(6-2)^2]-(4*17/2)
----------------------- <-- divided by
[(24/3)/3}

thanks you ps im not goin to reply back sayin thank you because i alrady did ;] namethree fraction whose decimal equivalent is 0.40.