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x² - 2x - 15 ⇒
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x² + 3x - 4 ⇒
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2x² + 5x + 2 ⇒ 2x² + x + 4x + 2
⇒ ( 2x² + x ) + ( 4x + 2 )
⇒ x ( 2x + 1 ) + 2 ( 2x + 1 )
⇒
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2x² - 7x - 15 ⇒ 2x² - 10x + 3x - 15
⇒ ( 2x² - 10x ) + ( 3x - 15 )
⇒ 2x ( x - 5 ) + 3 ( x - 5 )
⇒