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When the polynomial mx^3 - 3x^2 + nx + 2 is divided by x + 3, the remainder is -1. When it is divided by x - 2, the remainder is -4. What ar

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When the polynomial mx^3 - 3x^2 + nx + 2 is divided by x + 3, the remainder is -1. When it is divided by x - 2, the remainder is -4. What are the values of m and n

Guest Apr 4, 2015

#1
+91972
+10

When the polynomial mx^3 - 3x^2 + nx + 2 is divided by x + 3, the remainder is -1.

When it is divided by x - 2, the remainder is -4. What are the values of m and n

$$\\f(x)=mx^3 - 3x^2 + nx + 2\\ f(-3)=m*-27-3*9+-3n+2=-1\\ -27m-27-3n+2=1\\ -27m-3n-25=1\\ -27m-3n=26\qquad (1)\\\\\\ f(2)=m*8 - 12 + 2n + 2=-4\\ 8m - 10 + 2n + 2=-4\\ 8m + 2n =4\qquad(2)\\$$

Now check what i have done because it is late and I could easily have made a mistake

Then solve the equations simultaneously. :)

Melody  Apr 4, 2015
Sort:

#1
+91972
+10

When the polynomial mx^3 - 3x^2 + nx + 2 is divided by x + 3, the remainder is -1.

When it is divided by x - 2, the remainder is -4. What are the values of m and n

$$\\f(x)=mx^3 - 3x^2 + nx + 2\\ f(-3)=m*-27-3*9+-3n+2=-1\\ -27m-27-3n+2=1\\ -27m-3n-25=1\\ -27m-3n=26\qquad (1)\\\\\\ f(2)=m*8 - 12 + 2n + 2=-4\\ 8m - 10 + 2n + 2=-4\\ 8m + 2n =4\qquad(2)\\$$

Now check what i have done because it is late and I could easily have made a mistake

Then solve the equations simultaneously. :)

Melody  Apr 4, 2015

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