simplify (8-0.02)^2 divided by 2+8.3*0.4
( a - b ) ^ 2 = a ^ 2 - 2 a b + b ^ 2
( 8 - 0.02 ) ^ 2 = 8 ^ 2 - 2 * 8 * 0.02 + 0.02 ^ 2 =
64 - 0.32 + 0.0004 = 63.6804
2 + 8.3 * 0.4 = 2 + 3.32 = 5.32
( 8 - 0.02 ) ^ 2 / ( 2 + 8.3 * 0.4 ) =
63.6804 / 5.32 = 11,97