maths2

Use the discriminant to determine the number of real roots the equation has.
7x2 + 3x + 1 =0

A. One real root (a double root)

B. Two distinct real roots

C. Three real roots

D. None (two imaginary roots)

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  1. Formula for discriminant:
    d = b^2 - 4ac
    note that if
    d = 0 : real, equal/double root
    d < 1 : imaginary roots
    d > 1 : real, unequal roots

    7x2 + 3x + 1 = 0
    d = 3^2 - 4(7)(1)
    d = 9 - 28
    d = -19
    Thus, it's D. imaginary roots.

    Hope this helps~ :3

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  2. thank u

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