if alpa and beta are zeros of the quadratic polynomial xx-5x+4
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x²-(1+4)x+4=0
x²-x-4x+4=0
x(x-1)-4(x-1)=0
(x-4)(x-1)=0
x=1,4
α,β=1,4
x²-x-4x+4=0
x(x-1)-4(x-1)=0
(x-4)(x-1)=0
x=1,4
α,β=1,4
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