Question 157919
(2z-3)1/2=9
Re-writing: {{{(2z-3)^(1/2)=9}}} ----------------------> working eqn
{{{((2z-3)^(1/2))^2=9^2}}}, square both sides to cancell exponent:
{{{((2z-3)^(1/cross(2)))^cross(2)=81}}}
{{{2z=81+3}}}, combine similar terms
{{{cross(2)z=cross(84)42/cross(2)}}}
{{{z=42}}}
To check go back working eqn:
{{{(2(42)-3)^(1/2)=9}}}
{{{(84-3)^(1/2)=9}}}
{{{(81)^(1/2)=9}}}
{{{9=9}}}
Thank you,
Jojo