1)factor the expression. x^2+7x+10 a) (x+3)(x+4) b) (x+2)(x+5) c) (x-2)(x-5) d) (x+1)(x+7) 2)factor the expression x^2-3x+2 a) (x+2)(x-1) b) (x+2)(x+1) c) (x-2)(x-1) d) (x-1)(x-3) 3)factor the expression -x^2+3x+40 a) -(x+2)(x-20) b) -(x-5)(x+8) c) (x-4)(x-10) d) -(x+5)(x-8) 4) find the gcf of the expression 3a^2+9 a)3 b)a c)a+3 d)3a 5)find the gcf of the expression 25b^2-20b a)25 b)5-b c)b d)5b