These are the first four diagrams of a sequence. The diagrams are made from white dots and black dots. The expression for the total number of dots in Diagram $$\(n\)$$ is $$\(\frac{1}{2}\left(3 n^{2}-n\right)\)$$. Find the total number of dots in Diagram 8. .............................................
Exam No：0580_w20_qp_41 Year：2020 Question No：7(c)(i)
Answer:
92
Knowledge points:
E2.1.1 Use letters to express generalised numbers and express basic arithmetic processes algebraically.
E2.1.2 Substitute numbers for words and letters in complicated formulae.
E2.1.3 Construct and rearrange complicated formulae and equations. (e.g. rearrange formulae where the subject appears twice.)
Solution:
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