16+72b+81b²+(2+9b)(2-9b)=0
16+72b+81b²+4-81b²=0
20+72b=0
72b=-20
b= -5/18 или - 0,27
(3/4-5d)(3/4+5d)+25d²-15/2d+9/16=0
9/16-25d²+25d²-15/2d+9/16=0
9/8-15/2d=0
9-60d=0
-60d= -9
d= 3/20 или 0,15
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16+72b+81b²+(2+9b)(2-9b)=0
16+72b+81b²+4-81b²=0
20+72b=0
72b=-20
b= -5/18 или - 0,27
(3/4-5d)(3/4+5d)+25d²-15/2d+9/16=0
9/16-25d²+25d²-15/2d+9/16=0
9/8-15/2d=0
9-60d=0
-60d= -9
d= 3/20 или 0,15