Question

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Answer 1

1) a = 2
b = 12/12 = 1
b - a = 1 - 2 = -1

2)0,3 = 3/10
Inversul lui 3/10 este 10/3

3)4x² + 3x - 10 = 0
Δ= 9 - 4 × 4 × (-10) = 9 + 160 = 169
x1 = (-3 + 13)/8 = -10/8 = - 5/4
x2 = (-3 - 13)/8 = =16/8 = -2

{-2, -5/4} ∪ {-2, 0} = { -2, -5/4, 0}