math123321
math123321
06-11-2015
Mathematics
contestada
If x=7 and y=-3
12-5xy +9x2y + 15-2y2
Respuesta :
TSO
TSO
06-11-2015
Just plug in x = 7 and y = -3 in place of x and y, respectively
[tex]12-5xy +9x^2y + 15-2y^2\\\\12-5(7)(-3) +9(7)^2(-3) + 15-2(-3)^2\\\\12 - (-105) + (-1323) + 15 -18\\\\12 + 105 - 1323 + 15 - 18 = \boxed{-1209}[/tex]
Your answer is
-1209
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