Expression 3: negative StartFraction, "a" squared Over 8 , EndFraction "x" plus "a" squared left parenthesis, negative StartFraction, 3 Over 16 , EndFraction plus 1 eighth ln left parenthesis, StartFraction, "a" Over 4 , EndFraction , right parenthesis , right parenthesis−a28x+a2−316+18lna4