A . Factor p^2+2p−35. p^2+2p−35 = ?

B. Factor z^2−4z−21

z^2−4z−21 = ?

C. Factor 3t^2+16t−12

3t^2+16t−12 = ?

D. Factor 6x^2+17x+7.

6x^2+17x+7 = ?

E. Factor 3z^2+26z−9.

3z^2+26z−9 = ?

F. x^2−9.

x^2−9 = ?

G. Factor z^2−6z+9.

z^2−6z+9 = ?

H. Factor n^3−9n completely.

n^3−9n = ?

I. Factor 2x^4+2x^3−20x^2 completely.

2x^4+2x^3−20x^2

WHATS THE ? SUPPOSED TO BE FOR EACH ONE HEL I'VE BEEN TRYNA SOLVE THESE FOR 2 DAYS NOW- AND PLEASE DONT ANSWER FOR THE POINTS ANSWER FOR THE SAKE OF MY D IN MATH-