Answer: Range: hx>=-8
Step-by-step explanation:
Find the vertex first:
2r^2 + 20r +42=
2(r^2 + 20r/2 +42/2)=
2(r^2 + 10r +21)=
2(r^2 + 10r +25-4)=
2(r^2 + 5r+5r +25-4)=
2(r(r+5)+r(r+5)-4)=
2((r+5)^2-4)=
2(r+5)^2-4*2=2(r+5)^2-8 ==> Vertex: (-(5), -8) ==> (-5, -8)
-8 is when the range starts
Range: hx>=-8
