x2 - 4x + 3 = 0 factors to (x - 1)(x - 3)
x = 1, 3
If you can't see this just by looking at it, recall the quadratic formula (remember this, it is so useful):-
The solutions for x of (ax^2 + bx + c = 0) are
( -b ± sqrt (b^2 - 4ac) ) / 2a
Try plugging in the values of a, b and c from the equation above, you will find the solutions for x.
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3 + -3
(0, -3)
3 + 0 = 3
a = 3 and y = 0
Oh, dude, it's like so simple. 0 plus 3 equals 3. I mean, come on, even a potato could figure that one out.