exam Maths Puzzle Numerical Ability

For the function defined by f(x) =5x - 4, find a formula for f -1(x).

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exam Other Question

can someone please help me with this problem:

What are the zeros of this polynomial if b = -2: f(x) = x^2 + 2x + 2b + bx? Convert the numberal 412 base 5 to base 10

I got 107 is this right?