silvouplait aidez moi pour les grand I

a) E= (x-3)² - (x-1)(x-2)
      =  x² + 9 - 6x - x² + 2x + x - 2
      = - 3x + 7
b) 99997² - 99999 x 99998
= (1000 000 -3)² - (1000000 - 1)(1000000 - 2)
=(10^6 - 3)² -(10^6 -1)(10^6 - 2)
=10^12 + 9 - 6x10^6 - 10^12 + 2x10^6 + 10^6 - 2
= - 3(10^6) + 7
 = - 3 millions + 7 = - 2 999 993

c) factoriser
(4x+1)² - (4x +1)(7x-6)
=(4x+1)(4x+1 - 7x + 6)
= (4x + 1)( - 3x + 7)

d) x = -1/4 ou x = 7/3