exam Maths Puzzle Numerical Ability

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log2(x-1) - log2(x+3)= log2(1/x)

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exam Other Question

find any rational roots for the equation: x^4 + 3x^3 - x^2 - 9x - 6 = 0 Help me solve

g(h(15))

if
g(x)=70
h(x)= -x^2 + 6x