What is the meaning of two identical real roots in the mathematical equation of grade three

According to the root formula, when the discriminant is not negative, the quadratic equation of one variable has two real roots, but special, when the discriminant = 0, the two real roots are the same, that is to say, the equation has two same real roots at this time, not to say only one real root is for the unification of the formula

π (x / 2) &# 178; X = 6.28, please help to solve this equation!

π（x/2)²X=6.28
x³/4=6.28÷3.14
x³/4=2
x³=8
x=2
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Solving equation (9 + x) × 2 = 28
（ 9 + x) × 2 = 28

（9+X）X2=28
18+2X=28
2X=10
X=5
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What is the meaning of two identical real roots in the mathematical equation of grade three