Odpowiedź:
a) (x+y)(x-y)=x^2-y^2
b) (t-7)(t+7)=t^2-49
c) (2p+3)(2p-3)=4p^2-9
d) (5m-n)(5m+n)=25m^2-n^2
e) (w+4u)(w-4u)=w^2-16u^2
f) (6a-5b)(6a+5b)=36a^2-25b^2
a) (x+y)(x-y) = x2-xy+xy-y2= x2-y2
b)(t-7)(t+7) = t2+7t-7t-49 = t2-49
c) (2p+3)(2p-3) = 4p2-6p+6p-9 = 4p2-9
d) (5m-n)(5m+n) = 25m2+5mn -5mn-n2 = 25m2-n2
e) (w+4u)(w-4u) = w2-4uw+4uw-16u2= w2-16u2
f) (6a - 5b)(6a+5b) = 36a2+30ab-30ab-25b2= 36a2-25b2
