X=-b/2a=-(-4)/2(2)=4/4=1
y=2(1)^2-4(1)+1=-1
so the point is (1,-1)
Complex roots come in pairs
if you have a root of 3+i you must have a root of 3-i
C.
3 degree of temperature is decreased every hour.
so total temperature difference in one hour is -3
and in 7 hours, the difference is 7 * -3
88.3 is what % of 21
21 × a percent = 88.3
Divide 21 on either sides to find the percentage.

=

% = 4.204
88.3 is 4.205% of 21