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21 is the remainder when x*x*x + 2x*x + kx + 3 is divided by x - 3. Find k. |
| Let p(x) = x3 + 2x2 + kx +3 Given that p(3) = 21 ie, 33+2 × 32 + k × 3 + 3 = 21 27 + 18 + 3k + 3 = 21 3k = 21 - 48 3k = -27 k = -27/3 =-9 |
