exam Maths Puzzle Numerical Ability

Please help me solve for x. I keep getting stuck.
f(x)= x^4+x^2-12.

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exam Other Question

A rectangle is 5 times as long as it is wide. If the area is 125 square feet, find its perimeter. Please help!
(2x1/2y1/3) (-3x1/3y1/6)
the 1,2 and 1,3 in first eqaution and 1/3 and 1/6 in second are the powers. I dont know how to solve. please help. Thank you!