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vodka [1.7K]
3 years ago
12

Help meeee please in quadratic equation

Mathematics
2 answers:
Leona [35]3 years ago
8 0
7x² + 31x + 12 = 0

x = -b ± √(b² - 4ac)
               2a
x = -(31) ± √((31)² - 4(7)(12))
                      2(7)
x = -31 ± √(961 - 4(84))
                   14
x = -31 ± √(961 - 336)
                  14
x = -31 ± √(625)
              14
x = -31 ± 25
           14
x = -31 + 25    or    x = -31 - 25
           14                          14
x = -6    or    x = -56
      14                 14
x = ⁻³/₇    or    x = -4
Natasha2012 [34]3 years ago
3 0
What part are you wanting to know about? The written of number 9? 
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schepotkina [342]

sales tax = 13.22 * .04

sales tax = .53  (round to the nearest cent)

total cost = cost of item + sales tax

total cost = 13.22 + .53

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