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D( x )
x+7 = 0
x+7 = 0
x+7 = 0
x+7 = 0 // - 7
x = -7
x in (-oo:-7) U (-7:+oo)
(6*x^2+49*x+45)/(x+7) = 0
6*x^2+49*x+45 = 0
6*x^2+49*x+45 = 0
DELTA = 49^2-(4*6*45)
DELTA = 1321
DELTA > 0
x = (1321^(1/2)-49)/(2*6) or x = (-1321^(1/2)-49)/(2*6)
x = (1321^(1/2)-49)/12 or x = (-(1321^(1/2)+49))/12
(x+(1321^(1/2)+49)/12)*(x-((1321^(1/2)-49)/12)) = 0
((x+(1321^(1/2)+49)/12)*(x-((1321^(1/2)-49)/12)))/(x+7) = 0
( x+(1321^(1/2)+49)/12 )
x+(1321^(1/2)+49)/12 = 0 // - (1321^(1/2)+49)/12
x = -((1321^(1/2)+49)/12)
( x-((1321^(1/2)-49)/12) )
x-((1321^(1/2)-49)/12) = 0 // + (1321^(1/2)-49)/12
x = (1321^(1/2)-49)/12
x in { -((1321^(1/2)+49)/12), (1321^(1/2)-49)/12 }
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