Solve for a
a = \frac{3 \sqrt{5}}{5} \approx 1.341640786
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\sqrt{5}a=7-4
Subtract 4 from both sides.
\sqrt{5}a=3
Subtract 4 from 7 to get 3.
\frac{\sqrt{5}a}{\sqrt{5}}=\frac{3}{\sqrt{5}}
Divide both sides by \sqrt{5}.
a=\frac{3}{\sqrt{5}}
Dividing by \sqrt{5} undoes the multiplication by \sqrt{5}.
a=\frac{3\sqrt{5}}{5}
Divide 3 by \sqrt{5}.
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