book Maths Puzzle Numerical Ability

I'm not sure how to solve a paragraph proof and a flow proof properly and I was wondering if you could give me some examples and show me the right way to solve them.

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book Other Question

Solve the equation:

(w - 4)^2 = 2w^2 - 6w + 1 solve for w
Please help me
For the function f(x)=x^2-2x+1
(a) find f(0)

(b) solve f(x)=0