Question 7 b iii
http://www.boardofstudies.nsw.edu.a...ms/pdf_doc/2011-hsc-exam-mathematics-ext1.pdf ---exam
http://www.boardofstudies.nsw.edu.a...ematics-extension-1-hsc-sample-answers-11.pdf --solutions
Can someone explain the solution to me, I don't know how they got the r=1 term onto the other half of the equation.
Shouldn't it be positive because (-1)^(1-1) = 1 and therefore stay on the left side of the equation?
http://www.boardofstudies.nsw.edu.a...ms/pdf_doc/2011-hsc-exam-mathematics-ext1.pdf ---exam
http://www.boardofstudies.nsw.edu.a...ematics-extension-1-hsc-sample-answers-11.pdf --solutions
Can someone explain the solution to me, I don't know how they got the r=1 term onto the other half of the equation.
Shouldn't it be positive because (-1)^(1-1) = 1 and therefore stay on the left side of the equation?