svp c pour demain extra urgent

a=9x carré+12x-10
a=9(0.5)carré+12(0.5)-10
a=9(0.25)+6-10
a=2.25+6-10

b=(3x+2)carré-14
b=(9xcarré+12x+4)-16xcarré
b=-7x carré+12x+4