exam Maths Puzzle Numerical Ability

I need help solving this problem. Thanks.

(Square root of 4x+1) + 3=0

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exam Other Question

Solve for x: √(x-6) - √(x-6) = 36 @ A quick examination of the problem reveals that the left side becomes zero, eliminating the variable altogether.
a. 6
b. 16
c. 10
d. No solution Multiply.

-3a ^2b/35a^5 * 14a^3b^2/-9b^4
My answer 2/15b
Is it correct?