Bonjour,
Rappel (identités remarquables):
•(a+b)²=a²+2ab+b²
•(a-b)²=a²-2ab+b²
•a²-b²=(a+b)(a-b)
U=4t²-25
U=2²t²-5²
U=(2t+5)(2t-5)
V=(t+3)²-16
V=(t+3)²-4²
V=(t+3+4)(t+3-4)
V=(t+7)(t-1)
W=(2x+1)²-25
W=(2x+1)²-5²
W=(2x+1+5)(2x+1-5)
W=(2x+6)(2x-4)
Z=(3i)²-(i+5)²
Z=(3i+i+5)(3i-i-5)
Z=(4i+5)(2i-5)
A=36-25x²
A=6²-5²x²
A=(6+5x)(6-5x)
B=100+60x+9x²
B=10²+2*10*3x+3²x²
B=(10+3x)²
C=2i(i+1)+2i(2i+1)
C=(i+1)(2i+2i)
C=4i(i+1)
D=b²-10b+25
D=b²-2*b*5+5²
D=(b-5)²