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Sagot :

CO0309

Réponse:

1)

[tex]a = 4 {x}^{2} + 5x + 3[/tex]

2)

[tex]b = - 5x \times 7 - 5x \times ( - x) \\ = - 35x + 5 {x}^{2} [/tex]

[tex]c = 9 {x}^{2} - 13x + 2[/tex]

3)

[tex]4(4a - 3)[/tex]

[tex]t(1 - 4t)[/tex]

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