
Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion 
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December 11th, 2018, 01:19 PM  #1 
Senior Member Joined: Dec 2015 From: iPhone Posts: 477 Thanks: 73  sqrt equation
$\displaystyle \sqrt{5x}=5x^2$

December 11th, 2018, 01:58 PM  #2 
Global Moderator Joined: Dec 2006 Posts: 20,469 Thanks: 2038 
Squaring gives $5  x = 25  10x^2 + x^4$, so $x^4  10x^2 + x + 20 = 0$. Hence $(x^2  x  4)(x^2 + x  5) = 0$. After solving that, check which of its roots satisfy the original equation. 
December 11th, 2018, 02:23 PM  #3 
Senior Member Joined: Dec 2015 From: iPhone Posts: 477 Thanks: 73 
I didnt notice that squaring gives a prod

December 11th, 2018, 02:45 PM  #4 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,290 Thanks: 1023 
What's a "prod"?

December 11th, 2018, 02:56 PM  #5 
Senior Member Joined: Dec 2015 From: iPhone Posts: 477 Thanks: 73 
Edit it , i meant product


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