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b² ≤ 16
b² - 16 ≤ 0
(b + 4)(b - 4) ≤ 0
M. zerowe:
b = -4, b = 4
a > 0, ramiona paraboli skierowane do góry
b ∈ < -4; 4 > (pod osią OX)
b)
1/4 c² ≥ 1
1/4 c² - 1 ≥ 0 |*4
c² - 4 ≥ 0
(c + 2)(c - 2) ≥ 0
M. zerowe
c = -2, c = 2
a > 0, ramiona paraboli skierowane do góry
c ∈ (-∞; -2 > U < 2; +∞) (nad osią OX)