exam Maths Puzzle Numerical Ability

for all real numbers x,y,a 3 square root 27xysquarez = what

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exam Other Question

Please help me in solving the quadratic equation x^2 - 7x + 12 = 0. Show all steps. Could someone please help me with this i forgot how you get the perimeter of a triangle.
Side 1 = 4
Side 2 = sqrt 5 - sqrt 3
Side 3 = sqrt 5 + sqrt 3