# What is the length of side BC of the triangle? Explain how you arrived at your answer.

Dec 27, 2016

@28#

#### Explanation:

Given that $A C = A B$,
$\implies 2 x + 7 = 4 x - 7$
$\implies 4 x - 2 x = 7 + 7$
$\implies 2 x = 14$
$\implies x = 7$
Given that $B C = 4 x = 4 \cdot 7 = 28$