x^2(8x-2/5)(5x+6/5)=???
x2( 8x - 2/5 )( 5x + 6/5 )
= x2( 40x2 + 48x/5 - 2x - 12/25 )
= x2( 40x2 + 38x/5 - 12/25 )
= 20x4 + 38x3/5 - 12x2/ 25
