Direct proof Quiz: answer key
Every answer, with a link to its step-by-step solution
| # | Answer | Level | Solution |
|---|---|---|---|
| 1 | 2(a + b) | Easy | Solved step by step |
| 2 | 2 × 2ab | Easy | Solved step by step |
| 3 | 2 × 2a2 | Easy | Solved step by step |
| 4 | 2(2ab + a + b) + 1 | Medium | Solved step by step |
| 5 | 2(2ab + a) | Medium | Solved step by step |
| 6 | 2(5a + 3) | Medium | Solved step by step |
| 7 | 7(a + b) | Medium | Solved step by step |
| 8 | 2(2a2 + 3a + 1) + 1 | Harder | Solved step by step |
| 9 | 4(a + 1) | Harder | Solved step by step |
| 10 | 16ab | Harder | Solved step by step |
Grade
Count your right answers and divide by the number of questions: A 90% or more, B 80%, C 70%, D 60%, F below 60%.