9x two the second power = 1

Set the factor '(-1 + x + 4x2)' equal to zero and attempt to solve: Simplifying -1 ... Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'.

Set the factor '(-1 + x + 4x2)' equal to zero and attempt to solve: Simplifying -1 ... Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'.

Set the factor '(-1 + x + 4x2)' equal to zero and attempt to solve: Simplifying -1 ... Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'.

Set the factor '(-1 + x + 4x2)' equal to zero and attempt to solve: Simplifying -1 ... Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'.

Set the factor '(-1 + x + 4x2)' equal to zero and attempt to solve: Simplifying -1 ... Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'.

Set the factor '(-1 + x + 4x2)' equal to zero and attempt to solve: Simplifying -1 ... Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'.

Step-by-step explanation:

Rewrite

9

x

2

as

(

3

x

)

2

.

(

3

x

)

2

−

1

Rewrite

1

as

1

2

.

(

3

x

)

2

−

1

2

Since both terms are perfect squares, factor using the difference of squares formula,

a

2

−

b

2

=

(

a

+

b

)

(

a

−

b

)

where

a

=

3

x

and

b

=

1

.

(

3

x

+

1

)

(

3

x

−

1

)

answer: it's d

step-by-step explanation:

x= cost per bracelet

number of bracelets * x + shipping charge = total cost

so

9x+9=72