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b)4a²+4a+1
c)a²-9b²
(2-5x)²
(-5x+2)²
25x²-20x+4
d)
(-2a-1)²
4a²+4a+1
e)
(a-3b)(3b+a)
(a-3b)(a+3b)
a²-9b²
4-20x+25x^2
d) (-2a-1)^2
4a^2-4a+1
e) (a-3b)(3b+a)
(a-3b)(a+3b)
a^2-9b^2
^- oznacza do kwadratu