Find the discriminate of the equation x2-4x+4=0
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d=b^2-4ac
=(-4x)^2-4×x^2×4
=16x^2 - 16x^2
= 0
so this equation have 2 equal roots
=(-4x)^2-4×x^2×4
=16x^2 - 16x^2
= 0
so this equation have 2 equal roots
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