Решите уравнение: ( 2x + 3)2 - (2 - 5x)2 - 2x =12x2 - ( 5 - 3x)2
4x2+12x+9-(4-20x+25x2)-2x=12x2-(25-30x+9x2)
4x2+12x+9-4+20x-25x2-2x-12x2+25-30x+9x2=0
-14x2+30=0
14x2=30
x2=30/14
x2=2.14
x=1.46
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4x2+12x+9-(4-20x+25x2)-2x=12x2-(25-30x+9x2)
4x2+12x+9-4+20x-25x2-2x-12x2+25-30x+9x2=0
-14x2+30=0
14x2=30
x2=30/14
x2=2.14
x=1.46