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ancho=y
xy=286
2x+2y=70
x=286/y
2(286/y)+2y=70
572/y +2y=70
572 +2y²
------------= 70
y
572 + 2y²=70y
2y² -70y +572=0
a=2
b=-70
c=572
________________
70 +√ (-70)² -4(2)(572)
x=----------------------------------------- = 22
2(2)
________________
286 -√ (-286)² -4(2)(572)
x=----------------------------------------- = 13
2(2)
Tomaremos estos dos valores debido a que si reemplazos cualquier de estos valores en x no saldrá los mismos valores
22 x13=286
2(22)+2(13)=70