x² - 4+ (x - 2)(2x + 1)
= x² - 4 + x*2x + x*1 - 2*2x * 2*1
= x² - 4 + 2x² + x - 4x - 2
= 3x² - 3x - 6
bonjour
x² - 4 + ( x - 2 ) ( 2 x + 1 )
= x² - 4 + 2 x² + x - 4 x - 2
= 3 x² - 3 x - 6
= 3 ( x² - x - 2 )
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x² - 4+ (x - 2)(2x + 1)
= x² - 4 + x*2x + x*1 - 2*2x * 2*1
= x² - 4 + 2x² + x - 4x - 2
= 3x² - 3x - 6
bonjour
x² - 4 + ( x - 2 ) ( 2 x + 1 )
= x² - 4 + 2 x² + x - 4 x - 2
= 3 x² - 3 x - 6
= 3 ( x² - x - 2 )