Bonsoir,
1) En prenant x = 1, on a
(2*1 + 3)(8 - 1)
= (2+3)*7
= 5*7
= 35
et
2*1² + 13*1 + 24
= 2 + 13 + 24
= 15 + 24
= 39
2) (2x + 3)(8 - x)
= 2x*8 + 2x *(-x) + 3*8 + 3*(-x)
= 16x - 2x² + 24 - 3x
= -2x² + 13x + 24
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Bonsoir,
1) En prenant x = 1, on a
(2*1 + 3)(8 - 1)
= (2+3)*7
= 5*7
= 35
et
2*1² + 13*1 + 24
= 2 + 13 + 24
= 15 + 24
= 39
2) (2x + 3)(8 - x)
= 2x*8 + 2x *(-x) + 3*8 + 3*(-x)
= 16x - 2x² + 24 - 3x
= -2x² + 13x + 24