## anonymous one year ago the value of the expression 2 (2 over sideways M over n=0) (n squared +2 to the power of n) is please explain how you got your answer

1. anonymous

$2\sum_{n=0}^{2}(n ^{2}+2^{n})$

2. anonymous

^this is the equation i was trying to write

3. anonymous

substitute 0 for n, 1 for n, 2 for n then add the results and multiply by 2 2((0+1) + (1 + 2) + (4 + 4))

4. anonymous

ok thank you so much peachpi

5. UnkleRhaukus

$2\sum_{n=0}^{2}(n ^{2}+2^{n})\\ =2\Big[\big(0^2+2^0\big)+\big(1^2+2^1\big)+\big(2^2+2^2\big)\Big]\\ =$