Question

Wykonaj mnożenie:

a) (x+√5)(x-√5)

b) (2y-√3)(y+1)

c) (a+√2)(a-√3)

d) (2√2+k)(√2-k)

Answer 1

a) (x+√5)(x-√5)=x²-5

b) (2y-√3)(y+1)=2y²+2y-√3y+1

c) (a+√2)(a-√3)=a²-√3a+√2a-√6

d) (2√2+k)(√2-k)=4-2√2k+√2k-k²=-k²-√2k+4