Question

Solve x2 - 4x - 7 = 0 by completing the square

Answer 1

The main rule is ax2+bx+c right

Answer 2

yes

Answer 3

The general rule for completing the square is:

x2+bx=(x+b/2)2-(b/2)

Answer 4

So it is:

(x+4/2)2-(4/2)=7

Answer 5

yes

Answer 6

Sorry I forgot the square in : -(4/2)

Answer 7

so it is: (x+2)2-2^2=7

Answer 8

(x+2)2-4=7

Answer 9

Take the -4 on to the other side so it becomes:

(x+2)2=7+4
(x+2)2=11

Answer 10

you need to find x so to remove the square u need to multiply both sides by square root

Answer 11

It becomes:

x+2=square root of 11

Answer 12

move the 2 to the other side and it becomes:

x=square root of 11+or- 2

Answer 13

Because it is a quadratic equation so it must have two solutions

Answer 14

Hope u understood