exam Maths Puzzle Numerical Ability

solve for x
3(x+4)=18

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exam Other Question

Hello
The chapter i am on is called solving square root and other radical equations. I have a question on my homework.

Here it is..

Solve each equation. Check for extraneous solutions.
(-2-x)^(0.5)-x=2

Thanks! What symbols or abbreviations are used to denote the set of Real numbers and the different subsets of the set of real numbers?