Find all complex solutions of x^2-5x+7=0

Question

Find all complex solutions of x^2-5x+7=0

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Anna 2 weeks 2021-10-01T09:50:06+00:00 1 Answer 0

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    2021-10-01T09:51:41+00:00

    Answer:

    x1=5/2+i

    x2=5/2-i

    Step-by-step explanation:

    x^2-5x+7=0

    a=1, b=-5, c=7

    x1=(-b+sqrt(b^2-4ac))/2a

    x1=(-(-5)+sqrt(5^2 – 4*1*7))/2

    x1=(5+sqrt(25-28))/2

    x1=(5+sqrt(-4))/2

    x1=(5+sqrt(4i^2))/2

    x1=(5+2i)/2

    x1=5/2+i

    x2=(-b-sqrt(b^2-4ac))/2a

    x2=(5-2i)/2

    x2=5/2-iw

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45:7+7-4:2-5:5*4+35:2 =? ( )