hollymgriffis hollymgriffis

10-04-2015
Mathematics

Answered

solve for b:

b² = 8b + 84

Answer :

Panoyin Panoyin

10-04-2015

b² = 8b + 84
b² - 8b - 84 = 0
b = -(-8) +/- √((8)² - 4(1)(-84))
   2(1)
b = 8 +/- √(64 + 336)
   2
b = 8 +/- √(400)
   2
b = 8 +/- 20
2
b = 4 + 10
b = 4 + 10 b = 4 - 10
b = 14 b = -6

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