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fomenos
3 years ago
13

Write an explicit formula for the sequence -13,-6,1,8

Mathematics
1 answer:
vladimir2022 [97]3 years ago
4 0

Answer:

\large\boxed{a_n=7n-20}

Step-by-step explanation:

It's an arithmetic sequence.

-6-(-13)=-6+13=7\\1-(-6)=1+6=7\\8-1=7

The difference is constant.

The explicit formula of an arihmetic sequence:

a_n=a_1+(n-1)d

Substitute:

a_1=-13,\ d=7

a_n=-13+(n-1)(7)                <em>use distributive property</em>

a_n=-13+7n-7\\\\a_n=7n+(-13-7)\\\\a_n=7n-20

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Answer:

Step-by-step explanation:

Without more input from you, it's hard to find an exact value for b.  However, b may take on a large range of values.  b = 10 and b = -3 (chosen arbitrarily) are acceptable choices.

Take a look at the quadratic formula.  The discriminant is b^2 - 4ac.  There is nothing about this equation that restricts or forbids the use of any value of b.

3 0
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