Question

if (x -3) is a factor of the polynomial (2x^ + x + k) then find k

Answer 1

x - 3 = 0

It is the factor .

x = 3

2x² + x + k = 0

2 × 3² + 3 + k = 0

2 × 9 + 3 + k = 0

18 + 3 + k = 0

21 + k = 0

k = -21

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Hope it helps you..

Answer 2

x=3,2×3+3+k,k=-9 is answer of your quarion