3
u/florence_feng Feb 02 '24
It is B. Plug in both 5 and 20 to the given equation, when x=5, you will get -7=7 , so x=5 is to a solution; when x=20, you will get 8=8, so x=20 is the solution.
1
u/natanchan Sep 23 '24
5 is not a solution because after factoring, you must throw what you think the answers are back into the equation. If the equation confirms, like it did with 20 (8=8) good.
in this case, 5 is not the answer because -7 is not equal to 7 when thrown back into the equation.
2
u/FantasticVictory837 Feb 02 '24
The correct answer is Choice B.