Докажите тождество: x^2-12x-45=(x-15)(x+3).

\[x^{2} - 12x - 45 =\]

\[= (x - 15)(x + 3)\]

\[x^{2} - 12x - 45 =\]

\[= x^{2} + 3x - 15x - 45\]

\[x^{2} - 12x - 45 =\]

\[= x² - 12x - 45 \Longrightarrow ч.т.д.\]