Question

if one root of the quadratic equation 3x²-kx-2=0 is 2 , then find the value of k ??​

Answer 1

3(4)-k(2)-2= 0

10 = 2k

k = 5

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Answer 2

u can also go through roots of the 2nd order equation that is root over( b square -4ac)/2a and equate this with 2 u can get ans but that will a little bit lengthy.