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by correct you mean the way it was typed ?

I mean that the point I made (as regards to the math part)

that the point I made is correct or not

{x^2} - x - 20 = 0
this is the problem they are working out

not really

You know if you say `x • y = 0`
then for it to be true, either x=0, or y=0

Right?

yes

Ok, now back to our problem....

Then, this "zero product property" (as I showed with `y•x=0`) has to work here too.

That means that either x-5 =0
or that x+4 =0
Correct or not?

Now, for what value of x is x-5=0?
And for what value of x is x+4=0?

it would be 4, and 5 ?

Please in order, and please try again

it would be -5, 4

x-5=0 x+4=0
(-5)-5=0 (4)+4=0
according to what you said:

so the property that they did wrong was the zero property

who did wrong?

Caitlyn and Gabby

One of them is correct. (But only one is correct, the other is wrong)

|dw:1437049882899:dw|

so would Gabby be correcr ?

|dw:1437050014096:dw|

so it would be Catilyn who is right ?

|dw:1437050054286:dw|

it seems as though you are trying to guess the answer....

x= -4 and x=5

yes

x=-4, x=5
that is correct