c^2 - d^2 (c - d)^2 2n x 5n 10 x 10^n (b + 2)^2 - (b - 2)^2 32b

Question

c^2 - d^2

(c - d)^2

2n x 5n

10 x 10^n

(b + 2)^2 - (b - 2)^2

32b

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Answer 1

1) (с^2 - d^2)/(c-d)^2=(c-d)(c+d)/(c-d)^2 = сокращаем c-d = c+d/c-d

2) 10*n^2/10^(n+1) = сокращаем 1 десятку = n^2/10^n