bonsoir
3 /4 - 2 ( 3 t + 1/2)²
= 3/4 - 2 ( 9 t² + 6 t/2 + 1 /4 )
= 3/4 - 18 t² - 12 t/2 - 2 /4
= 3/4 - 18 t² - 6 t - 2/4
= - 18 t² - 6 t + 3/4 - 1/4
= - 18 t² - 6 t + 1/2
( 5 x - 2 y /5 ) ²
= 25 x² - 20 xy /5 + 4 y²/25
(u /3 + 1 ) ( u /3 - 1 ) - 4 u/9 ( 1 + u )
= u²/9 - 1 - 4 u/9 - 4 u² /9
= - 3 u² /9 - 4 u /9 - 1
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bonsoir
3 /4 - 2 ( 3 t + 1/2)²
= 3/4 - 2 ( 9 t² + 6 t/2 + 1 /4 )
= 3/4 - 18 t² - 12 t/2 - 2 /4
= 3/4 - 18 t² - 6 t - 2/4
= - 18 t² - 6 t + 3/4 - 1/4
= - 18 t² - 6 t + 1/2
( 5 x - 2 y /5 ) ²
= 25 x² - 20 xy /5 + 4 y²/25
(u /3 + 1 ) ( u /3 - 1 ) - 4 u/9 ( 1 + u )
= u²/9 - 1 - 4 u/9 - 4 u² /9
= - 3 u² /9 - 4 u /9 - 1