exam Maths Puzzle Numerical Ability

Find the value of x in logx + 1/logx = 5/2

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exam Other Question

V=R(1/x squared-1/y squared)solve for y
v=r((1/x^2)-(1/y)^2)
v/r=x^-2 - y^-2
(v/r)-(x^-2)=-y^-2
(x^-2)-(v/r)=y^-2
y=((x^-2)-(v/r))^(-1/2)
Write as a single log and simplify. 2/3 logbase8 64 - 1/2 logbase8 16 +3 logbase8 4