1) -7x² + 8, 3 + 4 = 0
2) 2x² - 50 = 0
2x²= 50
x² = 50: 2
x² = 25
x = √25
x = 5
ответ: 5
3) 6x² - 42x = 0
6x² = 42x | : x
6x = 42
x = 42 : 6
x = 7
ответ: 7
1)2x2-50=0
x2-25=0
x2=25
x=+5;-5
2)6x2-42x=0
6x(x-7)=0
x(x-7)=0
x=0. x-7=0
x=7
1) -7x² + 8, 3 + 4 = 0
2) 2x² - 50 = 0
2x²= 50
x² = 50: 2
x² = 25
x = √25
x = 5
ответ: 5
3) 6x² - 42x = 0
6x² = 42x | : x
6x = 42
x = 42 : 6
x = 7
ответ: 7
1)2x2-50=0
x2-25=0
x2=25
x=+5;-5
2)6x2-42x=0
6x(x-7)=0
x(x-7)=0
x=0. x-7=0
x=7