exam Maths Puzzle Numerical Ability

Solve: logbase2(1-x)+logbase2(4x+1)=0

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Can someone please help me with this problem:
If g(x) is an inverse of f(x), then how do the x-values and y-values coordinates of the points on f(x) map onto coordinates of g(x)? Add -4 to both sides of the inequality 6 > 2. Then divide both sides of the inequality -10 > -15 by -5. Explain in your own words what happens in both examples and when the directi