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2a² - a - 3 = 0
Δ=1-4*2*(-3) = 25
a₁= (1-5)/4 = -1
a₂= (1+5)/4 = 1½
2a² - a - 3 = 0
Δ = 1 + 24 = 25
√Δ = √25 = 5
a₁ = 1 - 5 / 4 = - 4 / 4 = - 1
a₂ = 1 + 5 / 4 = 6 / 4 = 1²/₄ = 1½