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Δ=81+280=361
√Δ=19
x1=9-19/4 ∨ x2=9+19/4
x1=-10/4 ∨ x2=28/4
odp. x=-2i1/2 ∨ x=7
b)ze wzoru skróconeo mnożenia a^2 -b^2=(a+b)(a-b)
x^2-36=0, x^2-6^2=0, (x-6)(x+6)=0
x=-6 ∨ x=6
c)
5x^2-6x=0
wystarczy wyciagnac 5x przed nawias.
5x(x-6/5)=0
x=0 ∨ x=6/5