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b)(2a-1)(a+4)=2a kwadrat +8a-a-4=2a kwadrat +7a-4
c)(4a-1)(2-3a)=8a-12a kwadrat -2+3a=-12a kwadrat+11a-2
d)(x+√5)(x-√5)=x kwadrat -5
e)(2y-√3)(y+1)=2y kwadrat +2y-√3y-√3
f)(a+√2)(√2-k)=√2a-ak+2-√2k