Q2 of 23 Page 1

Attempt any four of the following sub questions:

If one root of the quadratic equation kx2 – 8x + 15 = 0 is 3, then find the value of k.

Put x = 3 in kx2 – 8x + 15 = 0, we get

⇒ k(3)2 – 8 × 3 + 15 = 0


⇒ 9k = 9


⇒ k = 1


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