pomoqite pjj rewit urovneniye
1)7x v kvadrate =28
2) 5x v kvadrate -12 x=0
3)x v kvadrate + 20 x +91=0
1)7x v kvadrate =28
2) 5x v kvadrate -12 x=0
3)x v kvadrate + 20 x +91=0
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Ответ:
Пошаговое объяснение:
1) x2 = 4
x = +-2
x=2
x=-2
2) x* (5x-12)=0
x=0
5x-12=0
x=0
x= 12:5
x1=0 ; x2=12:5
3) D = 20 в квадрате -4 * 1 * 91 = 400 - 364 = 36
x1 = -20 + 6:2*1 = -14:2 = -7
x2 = -20-6:2*1 = -26:2 = -13