Advanced MathMediumSum of the coefficients of a polynomial sum
Advanced Math practice question
The sum of the expressions 3x² − 2x + 1 and −x² + 5x − 4 can be written as ax² + bx + c, where a, b, and c are constants. What is the value of a + b + c?
Answer: 2
The sum is 2x² + 3x − 3, so a + b + c = 2 + 3 − 3 = 2.
Common wrong answers
- If you answered 5
- 5 is a + b without c.
- If you answered 8
- 8 adds the absolute values.
- If you answered -2
- −2 has the sign of the whole sum wrong.
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