anonymous
  • anonymous
Find the remainder when f(x) is divided by (x - k) f(x) = 8x^4 + 7x^3 + 5x^2 - 5x + 35; k = 4
Mathematics
chestercat
  • chestercat
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RadEn
  • RadEn
use the remainder theorem, remainder = f(4) = .... (just plug x=4)
anonymous
  • anonymous
4220
anonymous
  • anonymous
@RadEn 4220

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anonymous
  • anonymous
Close
anonymous
  • anonymous
2591
anonymous
  • anonymous
What did you substitute for x?
anonymous
  • anonymous
4
RadEn
  • RadEn
yes, 2591
anonymous
  • anonymous
Yep
ZeHanz
  • ZeHanz
You can use synthetic division: 4 [ 8 7 5 -5 35 ] 32 156 644 2556 ------------------------+ 8 39 161 639 2591 <--- remainder Explanation of synthetic division: write out the coefficients of the powers of x, in the right order (8, 7, 5, -5 and 35) Put 4 in front (the value of k) the first coefficient, 8 goes straight down. Multiply 4 with 8, put 32 in the next column. Add the numbers: 39 Multiply 4 with 39, put 156 in the next column. Adding gives 161. Etc. the last number you get this way is the remainder!

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