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Решите уравнение:
1) ( 4 + 9b )² + ( 9b + 2 ) * ( 2 - 9b ) = 0
Решите уравнение:
1) ( 4 + 9b )² + ( 9b + 2 ) * ( 2 - 9b ) = 0
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(4+9b)²+(9b+2)(2-9b)=016+72b+81b²+(2+9b)(2-9b)=0
16+72b+81b²+2²-81b²=0
16+72b+81b²+4-81b²=0
72b+20=0
72b=-20
b=-20/72
b=-5/18