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solve for b:

b² = 8b + 84

Sagot :

Panoyinidn
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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