Solve for x
x=4
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\frac{90}{9}=\sqrt{25x}
Divide both sides by 9.
10=\sqrt{25x}
Divide 90 by 9 to get 10.
\sqrt{25x}=10
Swap sides so that all variable terms are on the left hand side.
25x=100
Square both sides of the equation.
\frac{25x}{25}=\frac{100}{25}
Divide both sides by 25.
x=\frac{100}{25}
Dividing by 25 undoes the multiplication by 25.
x=4
Divide 100 by 25.
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