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Multiply (3x + 5y + 4z) by (2x - 3y + z)

Mathematics
JAMB 1979
Multiply (3x + 5y + 4z) by (2x - 3y + z)
  • A. 6x2 + xy - 15y2 + 4z2 + 11xz - 7yz
  • B. 6x2 + 3xy - 15y2 + 4z2
  • C. 6x2 + 3xy - y2 + 4z2
  • D. 6x2 + 3xy - 15y + z2
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Correct Answer: Option A
Explanation
(3x + 5y + 4z)(2x - 3y + z)

6x2 + 9xy + 3x2 + 10xy - 15y2 + 5yz + 8xz - 12yz + 4z2

= 6x2 + xy - 15y2 + 4z2 + 11xz - 7yz
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Project Topics and Materials, Post-UTME past questions - Download now or upload yours to get paid
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
Project Topics and Materials, Post-UTME past questions - Download now or upload yours to get paid
NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
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