Question

3^n+3+4*3^n+2-6*3^n+1-45*3^n=​

Answer 1

$(1+4-6-45)*3^n+3+2+1=-46*3^n+6=-6(23*3^{n-1}-1).$

Answer 2

$\it = 3^n(27+36-18-45)=3^n\cdot0=0$