anonymous
  • anonymous
Simplify: (k + 4)(2k + 5)=
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
2k2-22k+20 2k2+9k+20 2k2+13k+20 None of the above
anonymous
  • anonymous
FOIL First: k*2k=2k^2 Outer: 5*k Inner: 4*2k Last:4*5 These are all added.
anonymous
  • anonymous
huh?

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Mertsj
  • Mertsj
Have you ever heard of FOIL?
anonymous
  • anonymous
So, first off, since you have two positive numbers, it can't be 2k^2 - 22k + 20. (k + 4)(2k + 5) Going off of what rickjbr explained earlier: - First (meaning the first two terms in each group): k x 2k = 2k^2 - Outer (meaning the first term in the first group and the last term of the second group): k x 5 = 5k - Inner (meaning the second term of the first group and the first term of the second group): 4 x 2k = 8k - Last (meaning the last two terms of each group): 4 x 5 = 20 In total: 2k^2 + 5k + 8k +20 Now just add together the like terms! This website does a good job of explaining the FOIL method way better than I ever could: http://www.algebrahelp.com/lessons/simplifying/foilmethod/pg2.htm I hope this helps! :D

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