ggez123 ggez123
  • 20-12-2019
  • Mathematics
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What is a quadratic equation that has a root sum of 1 and product of -1?

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kudzordzifrancis
kudzordzifrancis kudzordzifrancis
  • 27-12-2019

Answer:

[tex]x^2-x-1=0[/tex]

Step-by-step explanation:

Let [tex]x_1[/tex] and [tex]x_2[/tex] be the roots of the required quadratic equation.

Then the equation is formed using:

[tex]x^2-(sum\:of\:roots)x+product\:of\:roots=0[/tex]

or

[tex]x^2-(x_1+x_2)x+x_1*x_2=0[/tex]

From the given information, sum of the roots is:

[tex]x_1+x_2=1[/tex] and the product is

[tex]x_1x_2=-1[/tex]

Therefore the required equation is

[tex]x^2-x-1=0[/tex]

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