х2-9+9=х2
легко и просто т
( x - 3 ) ( x + 3 ) + 9 =
x² - 3² + 9 =
x² - 9 + 9 =
x²
(a + b)(a - b) = a² - b²
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х2-9+9=х2
легко и просто т
( x - 3 ) ( x + 3 ) + 9 =
x² - 3² + 9 =
x² - 9 + 9 =
x²
(a + b)(a - b) = a² - b²