If x = 3 and y = -1, evaluate 2(x\(^2\) - y\(^2\))
MATHEMATICS
WAEC 2020
If x = 3 and y = -1, evaluate 2(x\(^2\) - y\(^2\))
- A. 24
- B. 22
- C. 20
- D. 16
Correct Answer: D. 16
Explanation
2(\(x^2 - y^2\))
= 2(x + y)(x - y)
= 2(3 + (-1))(3 - (-1))
= 2(2)(4) = 16
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