Question

2(4X-1)^2+4.2=6+10^2

Answer 1

2{4x-1}²+4.2}≈10² 

2{4x-1}²+ 8≈ 100
2{4x-1}²≈92
{4x-1}²≈46
4x-1≈√46

x1 ≈  √46+1÷4      x2≈-√ 46+1÷4