book Maths Puzzle Numerical Ability

Simplify square root of (x^2+4).

thanks, Kyle

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book Other Question

how do you answer an equation in an ordered pair?

5x+5y=0
3x+y=-10 Am I doing these right?
Simplify
(x - 8)(x+5) I have x^-3x - 40
(d-2b)(d+4b) I have d^+2db - 8b^