How do you solve $(2r-5)^2=81$ ?

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How do you solve $(2r-5)^2=81$ ?

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Answer 1 · 2016-08-05T10:38:14

$r=7$
$r=-2$

Explanation:

$(2r-5)^2=81$
or
$2r-5=+-sqrt81$
or
$2r-5=+-9$
or
$2r=5+-9$
or
$r=(5+-9)/2$
or
$r=(5+9)/2$
or
$r=14/2$
or
$r=7$ -------------Ans $1$
or
$r=(5-9)/2$
or
$r=-4/2$
or
$r=-2$ ------------Ans $2$

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How do you solve $(2r-5)^2=81$ ?

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How do you solve $(2r-5)^2=81$ ?