Worked examples
Two examples
Example 1
Solve: 3(x − 4) = 15
- Multiply out: 3x − 12 = 15.
- Then 3x = 27, so x = 9.
Answer: x = 9
Example 2
Solve: 2(x + 3) = 4x − 8
- Multiply out: 2x + 6 = 4x − 8.
- Subtract 4x: −2x + 6 = −8. Then −2x = −14, so x = 7.
Answer: x = 7
Where this is taught: Quiz 40: Quadratic Equations, “Parentheses in the way”
The drill
Ten problems
This drill also has challenge problems. They use the same skill, set up the way the GED test sometimes sets up a problem, so that it looks new at first.
How many:
Type each answer, then press Check my answers at the bottom. Commas in large numbers are fine.Write each answer on the line. The answer key, with the reasoning, is on the last page.