Besoin d'aide pour la factorisation : C'est pour demain :/

Factorise sais expressions :

A = x²-16

b = 1-y²

C = 100x²-9

D = 36-81z²

E = 4m-25

F = (t+3)²-16

G = (2x+1)²-25

H = (3i+7)²-(i+5)²

Merci a ceux qui répondront ! :)

1

Réponses

2014-03-16T20:25:30+01:00
Bonsoir

A = x²-16  =  (x+4)(x-4)

b = 1-y²  = (1-y)(1 +y)

C = 100x²-9 = (10x -3)(10x +3)

D = 36-81z²  = ( 6 - 9z)(6 +9z)

E = 4m-25 = je suppose m² donc (2m -5)(2m +5)

F = (t+3)²-16  (t+3+4)(t+3 -4) = ( t+7)(t -1)

G = (2x+1)²-25 = (2x +1 +5)(2x +1-5) = (2x +6)(2x -4)

 H = (3i+7)²-(i+5)²
= (3i +7 +i +5)(3i+7 -i -5) = (4i +12)(2i +2)