√20- √5

<p>√20 - √5 =</p><p>&nbsp;</p><p>Sederhanakan √20 dahulu.</p><p>√20 = √(4 x 5)</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= √4 x √5</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 2√5</p><p>√20 - √5 = 2√5 - √5</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= (2-1)√5</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 1 √5</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;<strong> = √5</strong></p><p><strong>Jadi, √20 -</strong> &nbsp;<strong>√5</strong>= <strong>√5</strong></p><p>&nbsp;</p>