Question 147658
a.  the vertex lies on the axis of symmetry __ the general equation is x=-b/(2a)


x=-9/[2(-1)] __ x=9/2 __ substituting __ f(9/2)=-(9/2)^2+9(9/2)-5 __ f(9/2)=-(81/4)+(81/2)-5 __ f(9/2)=61/4



b.  FOILing __ 12-15i-8i+10i^2 __ 12-23i+10(-1) __ 2-23i



1.  distributing __ 20x-5-2x+10=6x+12 __ 18x+5=6x+12 __ subtracting 6x+5 __ 12x=7 __ dividing by 12 __ x=7/12