exam Maths Puzzle Numerical Ability

Solve by completing the square

x^2-16x+63=0

Thanks for any help.

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exam Other Question

find the area of an equilateral triangle whose perimeter is 12cm.
thank you for all your help! i just cant get this.
Use the properties for radicals to simplify each of the following expressions. Assume that all variables represent positive real numbers.

√12x^3 /5



THis is my radical symbol √