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? asked in Science & MathematicsMathematics · 1 decade ago

the discriminant > equal roots?

I have this question :

consider the equation x^2 + (k + 2)x + 4 = 0

for what values of ' k ' does the equation have equal roots?

could any one please answer this question

thank you.

2 Answers

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  • δοτζο
    Lv 7
    1 decade ago
    Favorite Answer

    (k+2)² - 4(1)(4) = 0

    k² + 4k + 4 - 16 = 0

    k² + 4k - 12 = 0

    (k + 6)(k - 2) = 0

    k = -6, 2

    When k = -6, 2 the polynomial will have 2 equal roots (2 in the first case, -2 in the second)

  • Ababee
    1 decade ago

    1. b - 4ac

    a = 1

    b = 2

    c = 4

    2- 4(1x2)

    2-8

    -6

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