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What is the sum of the squares of the roots of $18x^2 +21x - 400$?

 Dec 30, 2019
 #1
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Using Quadratic Formula , you will find   roots  x =150/36   x=−192/36   Square then  add them for your answer....cheeky

 Dec 30, 2019
edited by ElectricPavlov  Dec 30, 2019
 #2
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thank you!

Guest Dec 30, 2019
 #3
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Actually, if you know vieta's, you could first compute the sum of the roots squared, and then you must subtract two times the product of the roots. This is the "easy way out."

 Dec 30, 2019

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