Question

18. The remainder on dividing the polyno
mial x + 2x' + kx + 3 by x - 3 is 21. Find
the value of k.​

Answer 1

HINT: since x-3 is the divisor by which we get the remainder 21 hence put the value of x=3 in the polynomial and equate the function with 21 to get the value of k .....

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Answer 2

Answer:

Step-by-step explanation:

x cube+2x square +kx+3 =21

We know x-3=0

x=3

Now substitute 3 in the above

3 cube+(2×3) square +(k×3)+3=21

27+(6) square +3k+3=21

27+36+3k+3=21

3k+66=21

3k=21-66

3k=-45

k= -45/3

k= -15 is the answer.