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March 27, 2017

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The numbers iã5 and -iã5 are solutions to which equation?

a. x^2+ã5=0

b. x^2+5=0

d. x^2-5=0

  • Algebra 2 - ,

    thank you do you know how to do it though?

  • Algebra 2 - ,

    of course. I got the answer

    you say √5i and -√5i are the solutions, so

    (x-√5i)(x+√5i) = 0
    x^2 - (√5i)^2 = 0
    x^2 - 5i^2 = 0
    but i^2 = -1, so
    x^2 + 5 = 0

  • Algebra 2 - ,

    omg thank you soooo much (:

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