Solve x2 + 6x + 7 = 0.

This wont factor so we could solve it by completing the square:-

x^2 + 6x = - 7

(x + 3) ^2 - 9 = - 7

(x + 3) ^2 = 2

x + 3 = + / - sqrt2

x = sqrt2 - 3, - sqrt2 - 3

= - 1.59, - 4.14 to nearest hundredth

So the answer would be c