book Maths Puzzle Numerical Ability

the square root of 18y+9 =y+5

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book Other Question

find the sum or difference indicated for each pair of polynomials
(4x - 6x + 5) + (3x + 14x - 6)
y^4 -3y^3 -2y^2 +10y -12=0 ; 1+i

one of these is the answer, which one is it:

(1 + or - i, -2,3) ; (+ or - 1, + or - 2, + or - 3, 4) ; (+ or - 2, + or - 4)