a) (x=pierwiastek 5)(x-pierwiastek 5)
b) (2y-pierwiastek 3)(y+1)
c) (a+pierwiastek 2)(a-pierwiastek 3)
d) (2pierwiastek 2+k)(pierwiastek 2-k)
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a) (x+√5)(x-√5)=x²-5
b) (2y-√3)(y+1)=2y²+2y-√3y-√3
c) (a+√ 2)(a-√3)=a²-√3a+√2a-√6
d) (2√ 2+k)(√2-k) = 4 -2√2k +√2k-k²=-k²+4-√2k