Bonjour,
a. x(2x + 5)+(3x - 1)(2x + 5)
2x² +5x + 6x² +15x -2x -5 =?
b. (2x+3)(x - 6)-(x-6)²
2x² -12x +3x -18 -(x² -12x + 36) =
2x² -12x +3x -18 -x² +12x - 36 =?
c.4(3z-5)² - 2z(3z-5)
4( 9z² - 30z +25) - 6z² +10z=
36z² -120z +100 -6z² +10z =?
d. (3t-5)²+ (3 - 5)(3t+5)
9t² -30t +25 + 9t +15 -15t -25 =?
je te laisse faire les opérations.
