Answer:
BC = 25 units
Explanation:
given the triangle with base angles Band C , congruent ( equal ), then
Δ ABC is isosceles with legs being congruent , then
AB = AC ( substitute values )
4x + 1 = 2x + 23 ( subtract 2x from both sides )
2x + 1 = 23 ( subtract 1 from both sides )
2x = 22 ( divide both sides by 2 )
x = 11
Then
BC = 3x - 8 = 3(11) - 8 = 33 - 8 = 25 units