Answer:
17. (2)
Explanation:
-5x(x+7)(2x-3)=0
divide both sides by -5
x(x+7)(2x-3)=0
*When the product of factors equals 0, at least one factor is 0*
Set the three factors up to zero
x=0
x+7=0
2x-3=0
solve the equation
x=0
x=-7
x=3/2
this equation has three solutions from least to greatest being; -7,0,3/2
And for number 18, that equation cannot factor, that being the error.
Let me know if this was unclear, I'll be happy to further help!