Hi, I am trying to simplify 1-2^(n+1)+2^n, I know the answer is 1-2^n but im not sure how they got there? Can someone please help me out. thank you
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Hello, $\displaystyle 2^{n+1}=2*2^n$ So factorise by $\displaystyle 2^n$ $\displaystyle 1-2^{n+1}+2^n=1-2*2^n+2^n=1+2^n(1-2)=1+2^n*(-1)=1-2^n$
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