Expression 4: "y" Superscript, 2 , Baseline equals StartFraction, "B" Superscript, 2 , Baseline left parenthesis, "L" squared minus 4 "x" squared , right parenthesis "L" Over 4 left parenthesis, 2 left parenthesis, "L" minus 2 "W" , right parenthesis "x" squared plus left parenthesis, "L" squared plus 8 "L" "W" minus 4 "W" squared , right parenthesis "x" plus 2 "L" "W" squared plus "L" squared "W" plus "L" cubed , right parenthesis , EndFraction Has graph. To audio trace, press ALT+T.y2=B2L2−4x2L42L−2Wx2+L2+8LW−4W2x+2LW2+L2W+L3