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Of the five quadratics listed below, four of them have two distinct roots. The fifth quadratic has a repeated root. Find the value of the repeated root.

-x^2 + 18x + 81
3x^2 - 3x - 168
x^2 - 4x - 4
25x^2 - 30x + 9
x^2 - 14x + 24

 

 May 3, 2020
edited by Guest  May 3, 2020
 #1
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Please fix the LaTeX.

 May 3, 2020
 #2
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-x^2 + 18x + 81 = -(x - 9)^2, so this is the quadratic with a repeated root.

 May 3, 2020
 #3
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Can you please help me find the value of the repeated root? Thanks!

 May 4, 2020
 #4
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From the factorization, the repeated root is 9.

Guest May 9, 2020

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