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D( x )
4*x < 0
4*x < 0
4*x < 0
4*x+0 < 0 // - 0
4*x < 0 // : 4
x < 0/4
x < 0
x in <0:+oo)
8*(4*x)^(1/2) = 7*x-14 // - 7*x-14
8*(4*x)^(1/2)-(7*x)+14 = 0
8*(4*x)^(1/2)-7*x+14 = 0
16*x^(1/2)-7*x+14 = 0
t_1 = x^(1/2)
16*t_1^1-7*t_1^2+14 = 0
16*t_1-7*t_1^2+14 = 0
DELTA = 16^2-(-7*4*14)
DELTA = 648
DELTA > 0
t_1 = (648^(1/2)-16)/(-7*2) or t_1 = (-648^(1/2)-16)/(-7*2)
t_1 = (18*2^(1/2)-16)/(-14) or t_1 = (-18*2^(1/2)-16)/(-14)
t_1 = (18*2^(1/2)-16)/(-14)
x^(1/2)-((18*2^(1/2)-16)/(-14)) = 0
1*x^(1/2) = (18*2^(1/2)-16)/(-14) // : 1
x^(1/2) = (18*2^(1/2)-16)/(-14)
( (18*2^(1/2)-16)/(-14) < 0 i 1/2 in (0:1) ) => x należy do O
t_1 = (-18*2^(1/2)-16)/(-14)
x^(1/2)-((-18*2^(1/2)-16)/(-14)) = 0
1*x^(1/2) = (-18*2^(1/2)-16)/(-14) // : 1
x^(1/2) = (-18*2^(1/2)-16)/(-14)
x^(1/2) = (-18*2^(1/2)-16)/(-14) // ^ 2
x = ((-18*2^(1/2)-16)^2)/196
x = ((-18*2^(1/2)-16)^2)/196
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