Question

if x=5/2 is a zero of a polmyial 2x2-kx-12
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Answer 1

since x = 5/2

putting x = 5/2 in equation

2(5/2)² - k(5/2) - 12 = 0

25/2 - 5k/2 - 12 = 0

25-5k-24/2 = 0

1-5k = 0

1 = 5k

k= 1/5

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