exam Maths Puzzle Numerical Ability

Find the imaginary solutions: x^2 + 20x + 101 = 0

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hI i have done this and would like to know if i am right . I took me 5 minutes to do it. Hope you help me. Tahnks

TWo numbers differ by 3. the sum of teh larger and one fourth the smaller is 13. What are the numbers. Determine which two functions are inverses of each other.

f(x) = square root sign with x under it
g(x) = 1/the square root of x
h(x) = x2