URGENTE
Sabendo que xy = 45 e x2 + y2 = 20, determine o valor de:
a) (x + y)² =
b) (x – y)² =
Sabendo que xy = 45 e x2 + y2 = 20, determine o valor de:
a) (x + y)² =
b) (x – y)² =
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=x²+y²+2xy = x²+y²-2xy
=20+2x45 =20-2x45
=20+90 =20-90
=110 =-70