Three students were given the expression shown and were asked to take a common factor out of two of the terms.

use the drop-down menus to complete the statements about whether each student's answer is an equivalent expression. then choose an expression that is equivalent.

4-9x+21

 x = 2.777777778

Step-by-step explanation:

Simplifying

4 + -9x + 21 = 0

Reorder the terms:

4 + 21 + -9x = 0

Combine like terms: 4 + 21 = 25

25 + -9x = 0

Solving

25 + -9x = 0

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-25' to each side of the equation.

25 + -25 + -9x = 0 + -25

Combine like terms: 25 + -25 = 0

0 + -9x = 0 + -25

-9x = 0 + -25

Combine like terms: 0 + -25 = -25

-9x = -25

Divide each side by '-9'.

x = 2.777777778

Simplifying

x = 2.777777778