(x-2y)kwadrat - (x-3y)(x+3y)
dla x=2,5
y=2
=x²-2y² - x²+3xy- 3xy-6y² = (-x² zkraca sie z x², - 3xy skraca sie z 3xy) =-2*4-6*4==8-24= -16
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=x²-2y² - x²+3xy- 3xy-6y² = (-x² zkraca sie z x², - 3xy skraca sie z 3xy)
=-2*4-6*4=
=8-24= -16