Sagot :
Bonsoir,
A=
x² + 18x = 81
(IR)
B=
y² -6y +9
(IR)
C=
25 - 20t +4t²
(IR)
D=
x² - 3x +2,25
(IR)
E=
81x² +162x +81
(IR)
F=
2,25p² - 7,5 p + 6,25
(IR)
IR:
(a+b)² = a² + 2ab + b²
(a-b)² = a² - 2ab +b²
Bonsoir,
A = (x+9)² = (x+9)(x+9) = x² + 9x + 9x + 9² = x² + 18x + 81
B = (y-3)² = (y-3)(y-3) = y² - 3x + - 3x + 9 = y² - 6x + 9
C = (5-2t)² = 25 - 20t + 4t² = 4t² - 20t + 25
D = (x-1,5)² = x² - 3x + 1,5² = x² - 3x + 2,25
E = (9x+9)² = 81x² + 162x + 81
F = (1,5p - 2,5)² = 2,25p² - 7,5p + 6,25