exam Maths Puzzle Numerical Ability

Simplfy 4a3n6+ 4(a3n)6= 4(an2)3. the numbers behind the variables are the exponents and the ones outside of the parenthesis.

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exam Other Question

x^2-4x-1=0 solve by completing the square. Solve the equation w=Cr-2 for r where C is a constant and r is the distance that the object is from the center of the earth.