Question

va rog !!!!!!!!! rapid astea 52 puncte+coroana+multumesc.

Answer 1

1) (√5)^2 = 5

[tex]\it \ e)\ \sqrt[3]{-125\cdot8} = -5\cdot2 =-10 \\\;\\ h)\ (-2\sqrt[3]3)^4 = (-2)^4 \cdot ( \sqrt[3]3)^4 = 16\cdot ( \sqrt[3]{3^4}) = 16\cdot ( \sqrt[3]{3^3\cdot3}) =16\cdot3\sqrt[3]3= \\\;\\ =\it 48\sqrt[3] 3[/tex]
---------------------------------------------------------------------

2)

d) √(x^2) = x  (fals)

  √(x^2) = |x| (adevărat)

√-9 = -3  (fals)

√-9 ∉ ℝ  (adevărat)

------------------------------------

3)

d) |a| -1 ≥ 0 ⇔ |a| ≥ 1 ⇔ a∈ ℝ\ (-1,  1)

h) a∈ ℝ

f) a∈ ℝ

e) a∈ ℝ