Bonjour,
Développer:
A = (2x + 3)^2 = 4x²+6x+6x+9= 4x²+12x+9
B = (4x - 5) (4x + 5)= 16x²-20x+20x-25= 16x²-25
C = (9 - 8x)^2= 81-72x-72x+64x²= 64x²-144x+81
Factoriser:
C= x^2 + 9x= x(x+9)
D = 16x^2 - 1 = (4x-1)(4x+1)
E = 16x^2 - 24x + 9= (4x-3)²
F = (4t - 1)^2 - (t + 5)^2= (4t-1-t-5)(4t-1+t+5)=(3t-6)(5t+4)= 3(t-2)(5t+4)
