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.
(Sorry for all of the parentheses)
