Разложите на множители 81c^2-d^2+9c+d.

Question

\[81c^{2} - d^{2} + 9c + d =\]

\[= (9c - d)(9c + d) + (9c + d) =\]

\[= (9c + d)(9c - d + 1)\]

Accepted Answer

\[81c^{2} - d^{2} + 9c + d =\]

\[= (9c - d)(9c + d) + (9c + d) =\]

\[= (9c + d)(9c - d + 1)\]

Ответ: