SVP AIDER MOI JARRIVE PAS JE SUIS NUL EN MATH

^ = au carré
112

a) =(3x+1)×(3x+1)
=6x^+3x+3x+1
=6x+6x^+1

b) = (7-x)×(7-x)
= 49-7x-7x-x^
= 49-x^

c) =(9-5x)×(9+5x)
=81+45x-45x-25x^
=81-25x^