Bonjour, pourriez-vous m'aider, svp.Merci.... Pergunta de ideia deYOUNGIRL14

YOUNGIRL14 @YOUNGIRL14

December 2020 1 111 Report

Bonjour, pourriez-vous m'aider, svp.
Merci

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twiguy18

Exercice 1 :

Développons f(x):

$3x(5x - 7) = 15 {x}^{2} - 21x$

1)

$15 \times {9}^{2} - 21 \times 9 = 1026$

2)

$15 \times {( - 2)}^{2} - 21 \times ( - 2) = 60 + 42 = \\ 102$

3)

$15 \times {4}^{2} - 21 \times 4 = \\ 240 \times 84 = 156$

Donc 4 n est pas un antécédent de 256.

Exercice 2:

1)

$2 \times ( { - 4)}^{2} - 3 \times ( - 4) - 9 = \\ 2 \times 16 + 12 - 9 = \\ 32 + 3 = 35$

2)

$3x + 4x - 6 - 8 {x}^{2} + 7x - 2 = \\ - 8 {x}^{2} + 19x - 8$

3)

$(5x - 1)(4x + 3) = 20 {x}^{2} + 15x - 4x - 3 = \\ 20 {x}^{2} + 11x - 3$

4)

${(3x - 2)}^{2} = 9 {x}^{2} + 4 - 12x$

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