Resolva:
( x + 2 ) . ( x^2 + 3x - 9 )
x³ + 5x² - 3x - 18
( x + 2 ) . ( x² + 3x - 9 )
x( x² + 3x - 9) => x³ + 3x² - 9x
2( x² + 3x - 9) => 3x² + 6x - 18
x³ + 3x² - 9x + 3x² + 6x - 18 => x³ + 5x² - 3x - 18
x³+5x²-3x-18
(x+2)(x²+3x-9) =
x³+3x²-9x+2x²+6x-18
x³+3x²+2x²-9x+6x-18
x³+5x²-3x-18
❤️❤️ Prontinho ❤️❤️
18/01/23
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