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5 August, 09:40

Use the discriminant to describe the roots of each equation. Then select the best description.

7x2 + 3 = 8x

double root

real and rational root

real and irrational root

imaginary root

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Answers (1)
  1. 5 August, 10:34
    0
    imaginary root

    Step-by-step explanation:

    7x^2 + 3 = 8x

    Subtract 8x from each side

    7x^2 - 8x + 3 = 8x-8x

    7x^2 - 8x+3 = 0

    This is in the form ax^2 + bx+c

    The discriminant is b^2 - 4ac

    a=7 b=-8 c=3

    b^2-4ac = (-8) ^2 - 4 (7) (3) = 64 - 84 = - 20

    Since this is negative, we have imaginary roots
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