Answer:
4x-12= 56
Explanation:
The three angles of a triangle add to 180 degrees
4x-12 + 2x+5 + 6x-17 = 180
Combine like terms
12x -24 = 180
Add 24 to each side
12x-24+24 = 180+24
12x = 204
Divide by 12
12x/12 = 204/12
x =17
The three angles are
4x-12 = 4(17)-12 =68-12 =56
2x+5 = 2(17)+5 =34+5 =39
6x-17 = 6(17) -17 =102-17=85
The second largest angle is 56