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Corradini905 Corradini905
  • 11-06-2014
  • Mathematics
Answered

If x = 3 and y = -1, then 3x2 + 2xy - 5 = ?

A: 18

B: 24

C: 12

D: 16

Verified Answer :

konrad509
konrad509 konrad509
  • 11-06-2014

\(3\cdot3^2+2\cdot3\cdot(-1)-5=27-6-5=16\)

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Lilith
Lilith Lilith
  • 11-06-2014

\(x = 3 , \ y = -1 \\ \\ 3x^2 + 2xy - 5 = 3\cdot 3^2 + 2\cdot 3\cdot (-1)-5=\\ \\=3\cdot 9 -6-5=27-11=16 \\ \\ Answer : \ D: \ \ 16\)


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