exam Maths Puzzle Numerical Ability

the square root of x-4 - the square root of x+8 =2

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exam Other Question

i have to simplify this equation 1/8(3x + 1)^(3/2) + 1/4(3x + 1)^(1/2)

thanks -3r+5-3s-7+8s-2t-r i dont need the answer, i just need to know how to do this kind of a problem...answer is optional. please help me do this!!!