4/5-5i? can someone solve this for me?

it is a math question and i cant get the answer right for anything.

4 / 5-5i

and

4x^2+25=20x

I have tried to solve them but cant seem to get the right answer thanks.

3 Answers

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  • Vira
    Lv 5
    1 decade ago
    Favorite Answer

    Do you mean 4/(5-5i) or 4/5 - 5i? Because the two are different. For the first case, multiply it by (5+5i)/(5+5i)

  • asd
    Lv 4
    1 decade ago

    4 / 5-5i = 4/5 - 4/5i = 4/5(1-1i)

    (nothing much to do here)

    4x^2+25=20x

    4x^2 - 20x + 25 = 0

    4(x^2 - 5x) = -25

    x^2 - 5x = -25/4

    x^2 - 5x + 25/4 = -25/4 + 25/4 =0

    (x - 5/2)^2 = 0

    x - 5/2 = 0

    x = 5/2

  • 1 decade ago

    I'm not sure. Sorry...

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