Решите уравнения 1) (6х-1)(6х+1)-4х(9х+2)=-1 2) (8-9х)х=-40+(6-3х)(6+3х)

Question

Решите уравнения
1) (6х-1)(6х+1)-4х(9х+2)=-1
2) (8-9х)х=-40+(6-3х)(6+3х)

Answer 1

1) 36х² -1 - 36х² - 8х + 1 = 0 
8х = 0 
х = 0
2) 8х - 9х² + 40 -36 + 9х² = 0 
8х = -4
х = -4 / 8 
х = - 1/2 = -0.5