Complete the square to slove 3x^2+12x=9

Exact form :

                 x = ± √ 7 − 2

Decimal form :

                 x = 0.6457  , -4.6457

Step-by-step explanation:

3x^2+12x=9

We will use formula " (b/2)^2 to create new term,

We will solve for x to complete the square

Exact form :

                 x = ± √ 7 − 2

Decimal form :

                 x = 0.6457  , -4.6457

1.4

2.3

step-by-step explanation:

the formula for the constant of variation is

y= kx

divide each side by x

y/x =kx/x

y/x =k

we know a and y

1.   y/x = k

4/1 =4

check the other values to make sure they are the same

8/2 = 4   12/3 =4   and 16/4 =4  

the constant of variation is 4

2.   y/x = k

3/1 =3

check the other values to make sure they are the same

6/2 = 3   9/3 =3   and 12/4 =3  

the constant of variation is 3

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225