exam Maths Puzzle Numerical Ability

Solve for x:
a) log base4 (x+2) + log base4 (n-4)=2
b) log base2 (x^2-2) - log base2 (1/2x+5)=1 Can someone please help me with these and show me how to check my answers ??????

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exam Other Question

A homeowner wants to fence a rectangular play yard using 48 ft of fencing. If the garden is x yards long, express the area as a function of the width, give domain, find the maximum Let P(x)=a3x^3 + a2x^2 + a1s + a0, where a3, a2, a1, a0 are integers
if P92)= 0, one coefficient must be an even integer. show which coefficient this is
thanks