Odpowiedź:
g) f(x) = 2x² + 3x - 5
a=2 b=3 c=-5
Δ = b²- 4ac
Δ= 3² - 4 × 2 × (-5) = 9 + 40 = 49
h) f(x) = 5x² + 10x
a= 5 b=10 c=0
Δ = 10² - 4 × 5 × 0 = 100 - 0 = 100
i) f(x) = 9x² - 81
a=9 b=0 c= -81
Δ = 0² - 4 × 9 × (-81) = 0 + 2916 = 2916
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Odpowiedź:
g) f(x) = 2x² + 3x - 5
a=2 b=3 c=-5
Δ = b²- 4ac
Δ= 3² - 4 × 2 × (-5) = 9 + 40 = 49
h) f(x) = 5x² + 10x
a= 5 b=10 c=0
Δ = b²- 4ac
Δ = 10² - 4 × 5 × 0 = 100 - 0 = 100
i) f(x) = 9x² - 81
a=9 b=0 c= -81
Δ = b²- 4ac
Δ = 0² - 4 × 9 × (-81) = 0 + 2916 = 2916
Szczegółowe wyjaśnienie: