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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
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Correct Answer: Option D
Explanation

2(\(x^2 - y^2\))

= 2(x + y)(x - y)

= 2(3 + (-1))(3 - (-1))

= 2(2)(4) = 16


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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
Join your school's WhatsApp group
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
Join your school's WhatsApp group