find the value of 'k' , if x-1 is a factor of 4x^3 + 3x^2 -4x+k
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x - 1 = 0
x = 1
4x^{3} + 3x^{2} - 4x + k = 0
[4(-1)]^{3} + [3(-1)]^{2} - 4(-1) +k = 0
(-4)^{3} + (-3)^{2} + 4 + k = 0
- 64 + 9 + 4 + k = 0
- 51 + k = 0
k = 51
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