book Maths Puzzle Numerical Ability

write as a single logarithm

log2(1/x)+log2(1/x^2)

Thank you

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book Other Question

i am so lost! how would i sipmlify radican 50y cubed? Please help me rationalize the expression 2sqrt3+sqrt2/sqrt3-sqrt2 so there are no radicals in the denominator. I came up with 4-sqrt6
Thanks a lot