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b)
c)
x^2-8x+16
Delta=64-4 (1×16)
Delta= 0
x= -b/2a=8/2=4
b)
x^2= (2+2 pierw. z 10)/5
x= pierw.z ((2+2 pierw. z 10)/5)
c). (3-x)(3+x)=x^2+4x+11
9 + 3x-3x-x^2= x^2+4x+11
9-x^2=x^2+4x+11
4x+2=0
4x=-2 /4
x=(-2/4)=(-1/2)