PLEASE HELLLLLLP!!!!!!!
1) factor the expression into an equivalent form
c^2-64
a) (c-4)(c-16)
b) (c-8)(c+8)
c) (c-4)(c+4)
d) (c+16)(c-4)

2) factor the expression into an equivalent form
12y^2-75
a) 12(y-25)(y-3)
b) 12(y-25)(y+3)
c) 3(2y-5)(2y+5)
d) 4(y-25)(y+3)

3) factor the expression
9y^2-36
a) 9(y-3)(y+3)
b) 9(y+2)(y+2)
c) 9(y-3)(y-3)
d) 9(y-2)(y+2)

4)factor the expression
-x^2+5x-4
a) -(x-5)(x+1)
b) -(x+5)(x-1)
c) -(x-1)(x-4)
d) =(x-1)(x+4)

5) factor the expression into an equivalent form
ab^2-b
a) ab+b
b) a(ab-b)
c) b(ab-b)
c) b(ab-1)