Answered

1/développer A=(9 - 5x)?
[tex] {?}^{2} [/tex]

3/ factoriser C = 81x?-36x +4
4/ factoriser D=100-X?
5/
a/ Développer E =5 (6x -3) + (6x - 3)?
b/Factoriser E=5 (6x -3) + (6x -3)?
6/
a/ Développer F = (4x+1)?-(6x-2) (4x+1)
b/ Factoriser F = (4x+1)? - (6x-2)(4x+1)
7
a/ Développer G = 64 (2x-5)?
b/ Factoriser G=64 -(2x-5)?

B/En développant les expressions factorisées obtenue
obtenez bien les expressions développées trouvées au A​

Sagot :

YEAHMAIKO

1- A = (9-5x)² = 9² - 2×9×5x + (5x)²

= 81 - 90x + 25x²

3- C= 81x² - 36x + 4 = (9x)² - 2×9x×2 + 2²

= (9x-2)²

4- D = 100 - x² = 10² - x² = (10-x)(10+x)

5- a/ E = 5(6x-3)+(6x-3)² = 30x-15+36x²-36x+9

= -6x+36x²-4

b/ E = 5(6x-3)+(6x-3) = (6x-3)(5+6x-3) = (6x-3)(2+6x)

6- a/ F = (4x+1)² - (6x-2)(4x+1) = 16x²+8x+1 - 24x²+6x-8x-2 = -8x²+6x-1

b/ F = (4x+1)² - (6x-2)(4x+1) = (4x+1)(4x+1-6x+2)

= (4x+1)(-2x+3)

7- G = 64 - (2x-5)² = 64 - (4x²-20x+25)

= 64-4x²+20x-25 = 39-4x²+20x