Explications étape par étape:
exercice 7
1) b2+2×b×3×3^2
- (b+3)^2
- 2) 2^2x^2-2×2x×7+7^2
- (2x)^2-2×2x×7+7^2
- (2x-7)
- 3) 10^2x^2
- (10x)^2-1^2
- (10x-1)(10x+1)
- 4) 2x-3-(3x+2))×(2x-3+(3x+2))
- (2x-3-3x-2)×(2x-3+3x+2)
- (-x-5)×(5x-1)
- exercice 8
- a (2x+7)×(2x+7-(5-x))
- (2x+7)×(2x+7-5+x)
- (2x+7)(3x+2)
- b (x+2-(x+1)) ×(x+2+(x+1))
- (x+2-x-1)(x+2+x-1))
- 1(2x+3)
- c (5x+2-(x-1))×(5x+2(x-1))
- (5x+2-x+1)×(5x+2+x-1)
- (4x+3)×(6x+1)
