exam Maths Puzzle Numerical Ability

Subtract
4x^2 - 5x from the sum of 9x^2 - 2 and 6x - 1.

This is my answer is it right?
-5x^2 - x + 1

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exam Other Question
2) Following through on your understanding of a logarithm being an exponent,

what would log b(ba) equal?

and

what would 10 log(x) equal? can someone explain to me why are polynomials important?