Решить эти уравнения: (Даю 20 баллов!)
1) (4 - х) (х + 5) + х² = 0
2) (2 - х) (3 - х) = (х + 2) (х - 5)
1) (4 - х) (х + 5) + х² = 0
2) (2 - х) (3 - х) = (х + 2) (х - 5)
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1) (4 - х) (х + 5) + х² = 0
4х+20-х2-5х+х2=0
4х+20-5х=0
4х-5х=-20
-1х=-20
х=20
2) (2 - х) (3 - х) = (х + 2) (х - 5)
5+х2-3х+х2=х2-5х+2х-3
5-3х=х2-5х+2х-3
-3х-х2+5х-2х=-3-5
-1х=-8
х=8