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x-5=0 x^2+x-20=0 x^2-5=0
x=5 ∆=b2 -4ac x^2=5
∆=12 -4*1*(-20) x1=pierwiastek z pięciu lub x2=- pierwiastek z 5
∆=1+80
∆=81
√∆=9
-b+√∆ -1+9 8
x1=--------=-------=----=4
2a 2*1 2
- b-√∆ -1-9 -10
x2=--------=-------=----= -5
2a 2*1 2
g)(4x^2-8x-+6)(4x^-8x)(-8x+6)=0
∆=b2 -4ac 4x-8x=0 -8x+6=0
∆=(-8) 2 -4*4*6 -4x=0 -8x=-6
∆=64-96 x=0 x=6/8=3/4
∆=-32