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D( x )
8*x-10 < 0
8*x-10 < 0
8*x-10 < 0
8*x-10 < 0 // + 10
8*x < 10 // : 8
x < 10/8
x < 5/4
x in <5/4:+oo)
(8*x-10)^(1/2) = 7 // - 7
(8*x-10)^(1/2)-7 = 0
(8*x-10)^(1/2) = -7 // + 7
(8*x-10)^(1/2) = 7 // ^ 2
abs(8*x-10) = 7^2 // - 7^2
abs(8*x-10)-7^2 = 0
x in (-oo:+oo)
abs(8*x-10)
8*x-10 >= 0
8*x-10 >= 0 // + 10
8*x >= 10 // : 8
x >= 10/8
x >= 5/4
x in <5/4:+oo)
8*x-7^2-10 = 0
x in (-oo:5/4)
10-(8*x)-7^2 = 0
abs(8*x-10)-7^2 = 0
/ | 10-(8*x)-7^2 = 0 i x in (-oo:5/4) | 8*x-7^2-10 = 0 i x in <5/4:+oo)
x in (-oo:5/4)
10-(8*x)-7^2 = 0
-8*x-39 = 0 // + 39
-8*x = 39 // : -8
x = 39/(-8)
x = -39/8
x in <5/4:+oo)
8*x-7^2-10 = 0
8*x-59 = 0 // + 59
8*x = 59 // : 8
x = 59/8
x in { -39/8}
x = 59/8
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