Q. If f(y)=8y2+39y−10, use synthetic division to find f(−4).
Set up synthetic division: Set up synthetic division with −4 outside the division box and the coefficients of f(y) inside: 8, 39, and −10.
Bring down leading coefficient: Bring down the leading coefficient, 8, to the bottom row.
Multiply and write result: Multiply −4 by 8 and write the result, −32, under the second coefficient, 39.
Add and write result: Add 39 and −32 to get 7, and write this under the line.
Multiply and write result: Multiply −4 by 7 and write the result, −28, under the third coefficient, −10.
Add and write result: Add −10 and −28 to get −38, and write this under the line.
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).
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