Advanced MathEasyArea from a quadratic rule for a rectangle
Advanced Math practice question
The area A of a certain rectangle, in square centimetres, is given in terms of its width w, in centimetres, by A = w(w + 3). What is the area when the width is 4 centimetres?
Answer: 28
4 × 7 = 28.
Common wrong answers
- If you answered 7
- 7 is the length alone.
- If you answered 16
- 16 is w² alone.
- If you answered 19
- 19 uses 4² + 3.
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