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If f(y)=8y2+39y10f(y) = 8y^2 + 39y - 10, use synthetic division to find f(4)f(-4).

Full solution

Q. If f(y)=8y2+39y10f(y) = 8y^2 + 39y - 10, use synthetic division to find f(4)f(-4).
  1. Set up synthetic division: Set up synthetic division with 4-4 outside the division box and the coefficients of f(y)f(y) inside: 88, 3939, and 10-10.
  2. Bring down leading coefficient: Bring down the leading coefficient, 88, to the bottom row.
  3. Multiply and write result: Multiply 4-4 by 88 and write the result, 32-32, under the second coefficient, 3939.
  4. Add and write result: Add 3939 and 32-32 to get 77, and write this under the line.
  5. Multiply and write result: Multiply 4-4 by 77 and write the result, 28-28, under the third coefficient, 10-10.
  6. Add and write result: Add 10-10 and 28-28 to get 38-38, and write this under the line.
  7. Identify coefficients and remainder: The numbers on the bottom row are the coefficients of the quotient polynomial and the remainder. The remainder is the value of f(4)f(-4).

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