Question

Решите уровнения : 7-(x+2)2=11-x2

Answer 1

7 -(х+2)² = 11-х²
7- (х²+4х+4) = 11-х²
7-х²-4х-4 =11-х²
3-х²-4х=11-х²
-х²-4х+х²=11-3
-4х=8
х=8: (-4)
х=-2
проверим:
7- (-2+2)² = 11- (-2)²
7-0 = 11-4
7=7