proszę o pomoc
sprowadz do najprostrzej postaci wyrażenia:
a) (a+3b)^2-(a-3b)^2
b) 2n(n-5)-(n-k)(n+k)-5n(2/5k-20
a)
(a+3b)^2-(a-3b)^2
a^2+6ab+9b^2-a^2-6ab+9b^2
18b^2
b)
2n(n-5)-(n-k)(n+k)-5n(2/5k-20)
2n^2-10n-n^2+k^2-2nk+100n
90n+k^2-2nk
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a)
(a+3b)^2-(a-3b)^2
a^2+6ab+9b^2-a^2-6ab+9b^2
18b^2
b)
2n(n-5)-(n-k)(n+k)-5n(2/5k-20)
2n^2-10n-n^2+k^2-2nk+100n
90n+k^2-2nk