exam Maths Puzzle Numerical Ability

For the function f(x)=x^2-2x+1
(a)find f(0)

(b)solve f(x)=0

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exam Other Question

1.3x squared-12x 2.2w squared-8w-10 3.4x squared-25 triangle ABC
A= 376"
B= 388"
C= ??
angle AC= 90deg

what is the formula and the answer for finding the measure of segmnet C?