Advanced MathMediumConstant remaining after cancellation
Advanced Math practice question
For every value of x, the expression (x + 2)(x + 5) − x(x + 7) has the same value. What is that value?
Answer: 10
(x² + 7x + 10) − (x² + 7x) = 10.
Common wrong answers
- If you answered 0
- 0 would need the constant to cancel too; only x² and 7x cancel.
- If you answered 7
- 7 is the coefficient that cancels.
- If you answered -10
- −10 subtracts in the wrong order.
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