math
posted by jen .
The number of tickets sold each day for an upcoming performance of Hanel's messiah is given by N(x)=0.6x^2+12x+10, where x is the number of days since the concert was first announced. when will daily ticket sales peak and how many tickets will be sold that day?

N(x) = .6[ x^2  20x + ....... ] + 10
= .6[x^2  20x + 100  100 ] + 10
= .6[(x10)^2  100 ] + 10
= .6(x10)^2 + 60 + 10
= .6(x10)^2 + 70
carry on with the answer ....