AlgebraEasyEquation whose solution is zero
Algebra practice question
For which value of x is the expression 4x + 9 equal to 9?
- A. 0Correct
- B. 9/4
- C. −9/4
- D. 1
Answer: A. 0
Subtract 9 from both sides: 4x = 0. Divide by 4: x = 0. Check: 4(0) + 9 = 9.
Why the other answers are wrong
- B. 9/4
- 9/4 comes from 4x = 9, forgetting to subtract the 9 that is already on the left side.
- C. −9/4
- −9/4 comes from moving the 9 over but dropping the 9 on the right: 4x = −9. Both 9s are there, and they cancel.
- D. 1
- 4(1) + 9 = 13, not 9.
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