Question

Which of the following quadratic functions has a graph that opens downward? Check all that apply. A. y=60x-15x^2 B. y=x^2+4x+8 C. y=2x^2-9x+3 D. y=-(5+2x^2)

Answer 1

a) because a=-15<0 and D because a=-2<0

Answer 2

a <0 and D >0 the graph will open downward and will cut exactly at two places to x axis.means it will have two real and distinct roots