if x=-1/2 is a solution of the quadratic equation 3x^2+2kx+3=0 find the value of k
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x = -1/2
is solution of 3x^2 + 2kx + 3 = 0
so, put the value of x in the quadratic equation
3(-1/2)^2 + 2k(-1/2) + 3 =0
3(1/4) - 2/2k + 3 = 0
3/4 - k + 3 = 0
k = 3/4 + 3
k = (3 + 12)/4
k = 15/4
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