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mathildemarcelin20
@mathildemarcelin20
April 2022
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Svpp
Exercice 1
On donne E=(4x-3)(2x+1)-(x+3)(8 x-6)
1/ Développer et réduire E.
21 Factoriser E
3) Calculer E pour r=0, x=-1 et r={
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hamelchristophe
Réponse :Explications étape par étape :soit E=(4x-3)(2x+1)-(x+3)(8 x-6)1) E=(4x-3)(2x+1)-(x+3)(8 x-6)E = (8x² + 4x -6x -3)- (8x² -6x + 24x -18) - on developpeE = 8x² - 2x -3 - 8x² + 6x - 24x + 18 E = -20x +15 on réduit2)E=(4x-3)(2x+1)-(x+3)(8 x-6)E = (4x -3)(2x +1) - (x+3)(2(4x -3)) on factorise 2 dans (8x -6)E = (4x - 3) [2x + 1 -2(x+3)] on factorise (4x - 3)E = (4x - 3)(-5)E = -5(4x - 3)3/ si x = -1 alors E = -5[4*(-1) -3] = -5(-4-3) = 35 * signifie multiplieralors E = 35il manque des infos dans l'intitulé de ton exercice concernant r=0J'espère avoir pu aider
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mathildemarcelin20
Merci beaucoup !!
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