Решите номер 2 плиззз

A)-36c -3.(5-6c)2 = -36c -3.(25-60c +36c2)=-36c-75+180c-108c2=
  = 144c-75-108c2
b)(7b-1)(1+7b)-b(4-3b)=49b2-1-4b+3b2 = 52b2-4b-1
c)(2k-3).(3+2k) - (3k-5)2 -30k=4k2-9-9k2+30k-25-30k=-5k2-34
2)(3y+1)2-9.(y+1)(y-1)=8y-16
9y2 +6y +1 -9y2+9=8y-16
6y+10 = 8y-16
2y= 26, y = 13