For number 9, we can infer that either (-2x) equals 0, or (5x-2) equals 0. if -2x = 0, then x = 0. if 5x-2 equals 0, then x= 2/5, so the first choice is correct.
For number 10, first add 7x to both sides, resulting in x^2 + 7x + 10 = 0 a=1 b=7 c=10
((-7)(plus or minus)(square root of (7^2 - 4(1)(10)))/2 (-7)(plus or minus)(square root of 9)/2 = (-7(plus or minus) 3)/2 so we have x= -2, or -5 so the last choice is correct.
