Answers

2016-05-07T19:57:15+05:30
X⁴ - 3x³ -7x² + 5x + k = 0 ( Subs. the zero i.e 3 ) 3⁴ -3*3³ -7*3²+ 5*7+k = 0 81- 3*27 - 7*9 + 35 + k = 0 81 - 81 - 63 + 35 + k = 0 -28 + k = 0 ∴ k = 28
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