for these three equations
x^2-4x+3=0
x^2-7x+2=20
x^2-3x=1
solve at least one by factoring
solve at least one by using the quadratic formula
solve the last one with either of the two options

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x^2 - 4x + 3 = 0 Hint (3 * 1 = 3) (3 + 1 = 4)

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