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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