Question 1172828
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Your equation is written and presented  INCORRECTLY.


The correct writing is  THIS:       (2x-3)^2 = 81.


The symbols   " ( )^2 "   say  that the expression in parentheses is squared.


MEMORIZE  it and use correctly in your future posts to this forum  (!)


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Regarding your problem,  learn the subject from the lesson

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/quadratic/lessons/Solving-quadratic-equations-without-quadratic-formula.lesson>Solving quadratic equations without quadratic formula</A>

in this site.