Tutorials

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TUTORIALS

ARITHMETIC SERIES

Write the the 9th, 11th and 23rd terms of the sequence where the first term is 5 and the common difference is d=-6.

Solution:

We are given:

a1=5, the first term

d=-6, the common difference

We know that the formula for the general term of an arithmetic series is: an=a1+(n-1)*d

Therefore, using this formula we can calculate the required terms.

a9=5+(9-1)*(-6)=-43

a11=5+(11-1)*(-6)=-55

a23=5+(23-1)*(-6)=-127

SOLVING A QUADRATIC EQUATION

x²+4x-12=0

Solution:

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