Question 7 Write the expression in expanded form. 81n x + In y O4 Inx + Iny Question 8 Write the expression in condensed form. logax + 4 loga y-3 loga x ) logax Question 9 Solution ln (x8y)1/2=(1/2 )(ln x8y) =(1/2)[ln x8+lny] =(1/2)×8 (lnx)+ (1/2)lny = 4 ln x+(1/2)ln y (1/2)logax+4 logay-3logax loga (x)1/2+logay4-logax3 = loga (x1/2y4)-logax3 = loga (x1/2-3y4) = logax-5/2y4 =loga (y4/x5/2).