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-x^2 + 3x +4 = 0
Δ = 3^2 - 4((-1)*4) = 9 + 16 = 25
pierwiastek z Δ = 5
x1 =( -b - pierwiastek z Δ)/2a = (-3-5)/-2 = 4
x2 = (-b + pierwiastek z Δ)/2a = (-3+5)/-2 = -1
Odp. x = -1 v x = 4
-1/4x^ + 3/4x + 1 = 0 /* -4
x^ - 3x - 4 = 0
D = 9 - 4 * 1 * (-4) = 9 +16 = 25
VD = 5
x1 = (3+5)/2 = 8/2 = 4
x2 = (3-5)/2 = -2/2 = -1
D - delta
V - pierwiastek