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.-x²-3x-2=0
∆=b²-4ac
∆=(-3) ²-4 razy (-1) razy (-2)
∆=9-8
∆=1
-b+√∆ 3+1 4
x1=----------------=---------------------=-----= -2
2a 2 razy (-1) -2
-b-√∆ 3-1 2
x2=----------------=---------------------=-----= -1
2a 2 razy (-1) -2
Zadanie3
|x-¹/₂|<4 lub x-1/2<4
-x+1/2<4 x<4 ½
-x<3 ½
x>-3 ½
b=(⁴/₉)⁻¹ *(⁴/₉)⁻¹/₂*(8⁻¹/₁₂)⁴
1 1
(4/9)⁻3/2 *(8)-3/4 =---* -----
3/2 ¾
4/9 81/9