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its mcq so its easy to solve
X is definitely wrong coz X is not the same as x

if (x+5) is a factor, then x = -5 would make the equation 0

if (x-5) is a factor, then x= 5 makes the equation 0

substitute x = 5 and x = -5 see which one makes it 0

Neither of them do.

check again

There all 4 little x's I just didn't mean to make the two middle one's capital x's.

So I'll try the other two to see which one is right

i managed to find the answer by substituting a value

try x = 5 again

ok, I will

Is the answer x = 5 ?

yes, x=5 is the root , so x-5 is the factor.

So the answer is D ? x - 5

yup.

5^3 = 125
125*2 = 250

5^2 = 25
25*14=350

24*5=120

Ok, thanks :)

got it ?