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Sagot :

RUBYSAKURA

Réponse:

1) A(x)=

[tex] = 9 {x }^{2} + 6x + 1 - 3 {x}^{2} + 21x - x +7 \\ = 6 {x}^{2} + 26x + 8[/tex]

2) A(x)=(3x+1)(3x+1-x+7)

=(3x+1)(2x+8)

3)A(-3)= (3x+1)(2x+8)

=(3×(-3)+1)(2×(-3)+8)

= -8 × 2

= -16

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