How do you solve using the completing the square method # x^2 + 7x – 9 = 0#?
To solve by completing the square, first add 9 to both sides
Then you have to manipulate the number in front of
Add this to both sides of the above equation, giving
This creates a perfect square on the left, such that
Take the square root of both sides, giving
Don't forget that
Plugging that into a calculator gives: