For any two numbers x and y, x ▲ y = x2 – y and x ▼ y = x + y2. What is the value of (4 ▲ 7) ▼ 3?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 18
Work out the bracket first with the rule for ‘▲’, then use its result as x in the rule for ‘▼’.
4 ▲ 7 \(=4^2-7=16-7=9\)
9 ▼ 3 \(=9+3^2=9+9=18\)