Will give medal.
The legs of an isosceles triangle have lengths x + 1 and -x + 7 . The base has length 3x - 3. What is the length of the base?
A. 4
B. 6
C. 3
D. Cannot be determined.

Question

Will give medal.
The legs of an isosceles triangle have lengths x + 1 and -x + 7 . The base has length 3x - 3. What is the length of the base?
A. 4
B. 6
C. 3
D. Cannot be determined.

sammixboo · Answer

This one @pinterestaddict15 ?

pinterestaddict15 · Answer

Yes, I put C and got it wrong.

sammixboo · Answer

I think it is D, because you do not have enough information. Can you try that? I am 90% sure it is D

pinterestaddict15 · Answer

Okay I'll try that, thanks, I suck at math.

directrix · Answer

@pinterestaddict15 
By definition, the legs of an isosceles triangle are congruent. That means that the legs have the same length.
Therefore,  x + 1 and -x + 7.
Solving, indeed you do get x = 3 as you cranked out above. 
Then, you posted "Yes, I put C and got it wrong."

directrix · Answer

The question is to find the length of the base, NOT the value of x.
So, if x = 3, then the base 3x - 3 = 3*3 - 3 = ?  
I see it as one of the options. What is it @pinterestaddict15