Find the value of k for which the polynomial x4 + 10x3 + 25x2 + 15x + k is exactly divisible by x+7?
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put x = - 7
7⁴ - 10 ( 7³) + 25 ( 7²) -15(7) + k = 0
so k= -91
7⁴ - 10 ( 7³) + 25 ( 7²) -15(7) + k = 0
so k= -91
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