Solution equation: 3 (2x + 3) ^ 2-39 = 0

Solution equation: 3 (2x + 3) ^ 2-39 = 0


3(2x+3)²=39
(2x+3)²=13
2x+3=±√13
2x=-3±√13
x=(-3-√13)/2,x=(-3+√13)/2



Solution equation: (10x-90 + 2x) / 2 = 75


(10x-90+2x)/2=75
10x-90+2x=75*2
12x-90=150
12x=240
x=20