Answer :
[tex]2n(6n-3)+4n[/tex]
substitute [tex]n=2.5[/tex]
[tex]2*2.5(6*2.5-3)+4*2.5=5(15-3)+10=60+10=70[/tex]
substitute [tex]n=2.5[/tex]
[tex]2*2.5(6*2.5-3)+4*2.5=5(15-3)+10=60+10=70[/tex]
[tex]n = 2.5, \ \\\\\ 2n(6n-3)+4n = 12n^2 - 6n +4n =12n^2-2n\\ \\12n^2-2n=12 *(2.5)^2-2*2.5=12*6.25-5=75-5=70[/tex]
