Yes or no:
3x2 − 21 = 3(x + 7)(x − 3)?

Question

Yes or no:
3x2 − 21 = 3(x + 7)(x − 3)?

primeralph · Answer

Nope.
I answered this already!

anonymous · Answer

...  Yes or no question and I gave you a medal for something htat I didnt understand!

anonymous · Answer

*that

anonymous · Answer

factor our your 3 first... that leaves you with
3(x^2-21)

anonymous · Answer

woops i mean 3(x^2-7)

primeralph · Answer

anonymous · Answer

$$3x^2-21$$$$3(x^2-7)$$$$3(x-\sqrt{7})(x+\sqrt{7})$$

anonymous · Answer

uh... (x^2-7)?

anonymous · Answer

@yummydum that is what @primeralph said and I doesnt make sense.

anonymous · Answer

to me atleast.

anonymous · Answer

what part doesnt make sense?

primeralph · Answer

@britanny_  Because you din't understand something doesn't mean it's senseless.
Know that.

anonymous · Answer

@primeralph, let's calm down here and try helping :) britanny said it didnt make sense to her, not that it was senseless

anonymous · Answer

Ok thanks @southpaw!  And @primeralph I didnt say that it was wrong.  I said that It was confusing to me.

anonymous · Answer

okay so when you have x^2-7
if you do x+sqroot(7) and x-sqroot(7), when you multiply that out it gives you an x^2  term and a constant but no x term

primeralph · Answer

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