C = - 2 x² + 2 x + 3 x - 3 + 3
= - 2 x² + 5 x
C = - x ( 2 x - 5 )
- x ( 2 x - 5 ) = 0
x = 0 ou 5/2
x = 3/2
- 2 ( 3/2)² + 5 *3/2 = - 2 * 9/4 + 15/2 = - 18/4 + 30 /4 = 12 /4 = 3
x = 5/2
- 2 ( 5/2)² + 5 * 5/2 = - 2 * 25/4 + 25/2 = - 50/4 + 50/40 = 0
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Verified answer
C = - 2 x² + 2 x + 3 x - 3 + 3
= - 2 x² + 5 x
C = - x ( 2 x - 5 )
- x ( 2 x - 5 ) = 0
x = 0 ou 5/2
x = 3/2
- 2 ( 3/2)² + 5 *3/2 = - 2 * 9/4 + 15/2 = - 18/4 + 30 /4 = 12 /4 = 3
x = 5/2
- 2 ( 5/2)² + 5 * 5/2 = - 2 * 25/4 + 25/2 = - 50/4 + 50/40 = 0