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D( x )
49*x^2-100 = 0
49*x^2-100 = 0
49*x^2-100 = 0
49*x^2 = 100 // : 49
x^2 = 100/49
x^2 = 100/49 // ^ 1/2
abs(x) = 10/7
x = 10/7 or x = -10/7
x in (-oo:-10/7) U (-10/7:10/7) U (10/7:+oo)
(7*x^2-(3*x)-10)/(49*x^2-100) = 0
(7*x^2-3*x-10)/(49*x^2-100) = 0
7*x^2-3*x-10 = 0
7*x^2-3*x-10 = 0
DELTA = (-3)^2-(-10*4*7)
DELTA = 289
DELTA > 0
x = (289^(1/2)+3)/(2*7) or x = (3-289^(1/2))/(2*7)
x = 10/7 or x = -1
(x+1)*(x-10/7) = 0
((x+1)*(x-10/7))/(49*x^2-100) = 0
( x+1 )
x+1 = 0 // - 1
x = -1
( x-10/7 )
x-10/7 = 0 // + 10/7
x = 10/7
x in { 10/7}
x = -1
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