Book Maths Puzzle Algebra

Solve by completing the square : W^2-4W = 17

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Book Other Question

Solve for X

sqrt(5x+1) +2 = 2x quadratic functions:
f(x)=2x^2-1
f(x)=8-x-x^2
y=x^2+5
Describe the y-intercept of the graph of a quadratic function?????
How can I answer that?
Thanks for your help.