Answer
4.8 x 10^-3
Step-by-step explanation:
Answer:
x^2 + 14x + 49 = 0
You can look at it and see that 1/3 is added to each term. The common difference is 1/3. If you want to be be more formal,
d = d4 - d3
d = 0 - - 1/3
d = 0 + 1/3
d = 1/3
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