quinnlow quinnlow
  • 19-01-2018
  • Mathematics
contestada

-3x 2 + 2y 2 + 5xy - 2y + 5x 2 - 3y 2 if x=2 and y=-1

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obenam obenam
  • 19-01-2018
if [tex]x=2,y=1[/tex] the formula becomes:
[tex]-3(2)^2 + 2\times1^2 + 5(2) - 2 + 5(2)^2 - 3\times1^ 2\\=(-12+2)+(10-2)+(20-3)\\=(-10+8)+17\\=-2+17\\=15[/tex]
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