Решите уравнение: -10x-(5-3x)(5+3x)=9x^2

Question

Решите уравнение: -10x-(5-3x)(5+3x)=9x^2

Answer 1

- 10х - ( 5 - 3х)( 5 + 3x ) = 9x^2
- 10x - ( 25 - 9x^2 ) = 9x^2
- 10x - 25 + 9x^2 - 9x^2 = 0
- 10x = 25
x = - 2,5