Nearest hundredth

X2+2x+7=21

Step-by-step explanation:

subtract 21 from both sides

x2+2x+7-21=21-21

x2+2x+14=0

use quadratic equation

x = (-3 + - (b^2-4ac) ^1/2) / 2a

in our equation a=1, b=2and c=14

(-2 + - (14+56) ^1/2) / 2

x=-1 + (60^1/2) / 2

there is only one positive answer and it is 2.87