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multiply √5(9-5√5)
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\[\sqrt{5}(9-5\sqrt{5})=\sqrt{5} \cdot 9 - \sqrt{5} \cdot 5 \sqrt{5}\]
i used the distributive property here
\[9 \sqrt{5}- 5 \sqrt{5} \sqrt{5}\] i used the commutative property here
\[9 \sqrt{5}-5 (5)\] since sqrt(5) sqrt(5)=5
\[ \sqrt{5}(9-5\sqrt{5})=\sqrt{5} \cdot 9 - \sqrt{5} \cdot 5 \sqrt{5} = 9 \sqrt{5} -25 \]
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\[9\sqrt{5}-25 \] since 5*5=25
thanks again
np :)
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