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Snezhnost [94]
3 years ago
13

Use the quadratic formula to solve 7c^2 + 8c + 1 =0

Mathematics
1 answer:
siniylev [52]3 years ago
4 0
7c² + 8c + 1 = 0
c = <u>-(8) +/- √((8)² - 4(7)(1))</u>
                     2(7)
c = <u>-8 +/- √(64 - 28)</u>
                 14
c = <u>-8 +/- √(36)
</u>              14
c = <u>-8 +/- 6</u>
          14
c = <u>-8 + 6</u>      c = <u>-8 - 6</u>
         14                 14
c = <u>2</u>              c = <u>-14</u>
     14                    14
c = ¹/₇            c = 1

The solution is equal to { 1, ¹/₇}.
<u />
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