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y = 1/4x² + x
- 1/4x² + 4 = 1/4x² + x
- 1/4x² - 1/4x² - x + 4 = 0
- 2/4x² - x + 4 = 0 / * 4
- 2x² - 4x + 16 = 0 / : 2
- x² - 2x + 8 = 0
a = - 1
b = - 2
c = 8
Δ = b² - 4ac = (- 2)² - 4 * (- 1) * 8 = 4 + 32= 36
√Δ = √36 = 6
x₁ = (- b - √Δ)/2a = (2 - 6)/- 2 = - 4/- 2 = 2
x₂ = (- b + √Δ)/2a = (2 + 6)/- 2 = 8/- 4 = - 2
odp
x = 2 lub x = - 2 dla y = 0
parabola skierowana ramionami do dołu o miejscach zerowych 2 i - 2
odp
x₁ = 1
x₂ = - 2