Book Maths Puzzle Algebra

If You subtract 27 from the product of 8 and a number, you get 1789. What is the number?

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Book Other Question

9x^6-26x^5-57x^4+201x^3+68x^2-445x-50 One of the solutions is 2-i Hi, I am trying to find the vertex, y-intercept, domain and range of the following equation:
y= -x^2-20x-3

when I try to fing the x cordinate of the vertex I get 303??? Is that