exam Maths Puzzle Numerical Ability

Find the solutions of the following equations. Check for extraneous solutions.
(x-5)^1/4+3=2

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exam Other Question

Divide
x^2 – 9x + 20/ 3x – 15 ÷ x^2 – 16/9x + 36

please help me understand these
in triangle ABC given that sides b=10,c=8, angle A=60degrees, find side a?

in triangle ABC given that sides a=4,b=8 and c=10, find cos B where B is the angle opposite to side b?