source : algebra.com

## 298 209 129 58 -4 choices are -13, -93, -66, -57

SOLUTION: select the next number in the series:

298 209 129 58 -4

choices are -13, -93, -66, -57

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Question 144227: select the next number in the series:298 209 129 58 -4

choices are -13, -93, -66, -57

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Found 2 solutions by stanbon, MathLover1:Answer by stanbon(75887) (Show Source):

You can put this solution on YOUR website! select the next number in the series:298 209 129 58 -4

choices are -13, -93, -66, -57—————-You take the successive differences and get:89….80….71…62—————–You take the successive differences again and get:9…..9….9——————-This tells you the pattern is quadratic———————Using the form y = ax^2+bx+c you generate three equations by substituting three points from the following:(1,298) (2,209) (3,129) (4,58) (4,-4)Doing that will give you three equations in a,b, c.Solve the system of equations and determine f(6) to get thenext number in the sequence.——-I get -57.==============Cheers,Stan H.

Answer by MathLover1(18205) (Show Source):

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