Solve the equation by completing the square. x2 + 4x - 10 = 0

Move - 10 under the zero which will be x2+4x=-10

Then divide 4x under - 10 which will get you - 2.5 then after that you're left with x2 = -2.5x which the you'll square root so you don't have to worry about being confused with the x2

So square root both side and you'll be left with x=2.5