Question

7.8x-(3x+1)(5x+1)
8.(y+2)(y+3)-(y^2+y)
9.(c+2)c+(c+3)(c-3)

Answer 1

8x-15x2-3x-5x+1=15x^2+1
y^2+3y+2y+6-y^2+y=6y+6
c^2+2c+c^2-9=2c^2+2c-9