Pour Cette aprem de l'aide

  9x²-30x+25 = (3x)²-2(3x*5)+5² = (3x-5)² 

2) x² + 10x + 25
= x² + 5 x 2x + 5 x 5
= 5(2x + 5)x²
= 5(2x² + 2 x 2x x 5 +5²)x²
= 5(2x + 5)x²
.

D= X²+10x+25
= x²+2*x*5²
=(x+5)²
E= 9x²+30x+25
=(3x)²+2*3x*5+5²
=(3x+5)²
F=4t²+24t+36
=(2t)²+2*2t*6+6²
=(2t+6)²