Advanced MathMediumValue of a quadratic model at a point
Advanced Math practice question
The area A, in square centimetres, of a stain t minutes after it forms is modelled by A = 5t² − 4. What is the area after 3 minutes?
Answer: 41
5 × 9 − 4 = 41.
Common wrong answers
- If you answered 11
- 11 uses 5 × 3 − 4.
- If you answered 45
- 45 forgets the −4.
- If you answered 221
- 221 uses (5 × 3)² − 4.
More Advanced Math questions
- Medium
What are the solutions to x² − 5x + 6 = 0? - Medium
The graph of f(x) = (x − 3)² + 4 is a parabola. What are the coordinates of its vertex? - Medium
If x² − 2x − 8 = (x + 2)(x − a), what is the value of a? - Medium
If √(x + 5) = 4, what is the value of x? - Medium
If f(x) = x + 3 and g(x) = 2x, what is f(g(4))? - Medium
What are the solutions to x² + 6x + 8 = 0?
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