y² + y - 30 = 0
a = 1, b = 1, c = - 30
Δ = b² - 4ac
Δ = (1)² - 4 · (1) · (- 30)
Δ = 1 + 120
Δ = 121
y = - b ± √Δ / 2a
y = - (1) ± √121 / 2 · 1
y = - 1 ± 11 / 2
y₁ = - 1 + 11 / 2 = 10 / 2 = 5
y₂ = - 1 - 11 / 2 = - 12 /2 = - 6
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y² + y - 30 = 0
a = 1, b = 1, c = - 30
Δ = b² - 4ac
Δ = (1)² - 4 · (1) · (- 30)
Δ = 1 + 120
Δ = 121
y = - b ± √Δ / 2a
y = - (1) ± √121 / 2 · 1
y = - 1 ± 11 / 2
y₁ = - 1 + 11 / 2 = 10 / 2 = 5
y₂ = - 1 - 11 / 2 = - 12 /2 = - 6