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What is the nth term of the quadratic sequence -4,-1,4,11,20

User Wilfrido
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1 Answer

6 votes

Answer:

76

Explanation:

the second number = the first one + 3

the third number = the second one + 5

the fourth number = the third one + 7

the fifth number = the fourth one + 9

because of this, we can know that we add an odd number to the left number

so

sixth = 20+11=31

seventh = 31+13=44

eighth = 44+15=59

ninth = 59+17=76

User Emelina
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