Advanced MathEasy–MediumEvaluating a quadratic model in context
Advanced Math practice question
A market stall's daily profit P, in dollars, from selling n crates of apples is modelled by P(n) = 3n² − 5. What is the profit, in dollars, on a day when 4 crates are sold?
Answer: 43
P(4) = 3(16) − 5 = 48 − 5 = 43.
Common wrong answers
- If you answered 7
- 7 computes 3 × 4 − 5, ignoring the square.
- If you answered 53
- 53 adds 5 instead of subtracting.
- If you answered 139
- 139 computes (3 × 4)² − 5, squaring the product instead of just n.
More Advanced Math questions
- Easy–Medium
If f(x) = 2x² − 3, what is f(4)? - Easy–Medium
Which expression is equivalent to (2x³)(3x⁴)? - Easy–Medium
What are the solutions to x² − 16 = 0? - Easy–Medium
Which expression is equivalent to (x + 5)²? - Easy–Medium
For x ≠ 0, which expression is equivalent to (x² + 3x) / x? - Easy–Medium
What are the solutions to the equation 2(x − 3)² − 32 = 0 ?
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