ile równa się a 2a* = a + 3 *-kwadrat
ile równa się a
2a* = a + 3
*-kwadrat
2a² = a + 3 2a² - a - 3 = 0 Δ=1-4*2*(-3) = 25 a₁= (1-5)/4 = -1 a₂= (1+5)/4 = 1½
2a² = a + 3 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