Find the value of k for which k x² + 5x – 3 = 0 has x = -3 as its root (a) 1 (b) 2 (c) 4 (d) 6​

Question

Find the value of k for which k x² + 5x – 3 = 0 has x = -3 as its root

(a) 1 (b) 2 (c) 4 (d) 6​

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Ayla 4 months 2021-09-24T14:32:25+00:00 2 Answers 0 views 0

Answers ( )

    0
    2021-09-24T14:33:50+00:00

    Answer:

    6

    Step-by-step explanation:

    Kx^{2}+5x-3=0

    k(-3)+5(-3)-3=0

    -3k-15-3=0

    -3k=18

    k=18by3

    k=6

    0
    2021-09-24T14:34:06+00:00

    Answer:

    2

    Step-by-step explanation:

    p(x) = kx² + 5x – 3

    As x = -3 as root , substituting x in p(x) ,

    p(-3) = k(-3)² + 5(-3) – 3 = 0

    = 9k – 15 – 3 = 0

    => 9k – 18 = 0

    => 9k = 18

    => k = 2

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