X^2 - 7*3x = 3
x^2 - 21x - 3 = 0
D = 441 + 4*3 = 441 + 12 = 453
x1 = ( 21 + √453)/2 ≈ - 0,141
x2 = ( 21 - √453)/2 ≈ 21, 142
3x²-6x+q=0
x²-2x+q/3=0
x1²+x2²=12
x1*x2=q/3
x1+x2=2
(x1+x2)²=2²
x1²+2x1*x2+x2²=4
12+2q/3=4
2q/3=4-12=-8
q=-8*3/2=-12
S = πR²=> S = 25π или 78,54
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