Question

Решите уравнение: ( 2x + 3)2 - (2 - 5x)2 - 2x =12x2 - ( 5 - 3x)2

Answer 1

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