4x^2-20=0
4x^2=20+0
4x^2=20
X^2=20:4
X^2=5
X1=-√5
X2=√5
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4x^2-20=0
4x^2=20+0
4x^2=20
X^2=20:4
X^2=5
X1=-√5
X2=√5