Question

wykonaj mnozenie

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-√25=x²-5

b (2y-√3)(y+1)=2y²+2y-√3y-√3

c (a+ √2)(a-√3)=a²+a√2-a√3-√6=

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

 

Answer 2

a)(x+√5)(x-√5)=x²-(√5)²=x²-5

b)(2y-√3)(y+1)=2y²+2y-y√3-√3

c)(a+√2)(a-√3)=a²-a√3+a√2-√6

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