1. D=64+80=144. x1=(8+12)/2=10. x2=(8-12)/2=-2
2. x+3=+6. x1=3
x+3=-6. x2=-9
3. 11-x=5. x=6
11-x=-5. x=16
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Answers & Comments
1. D=64+80=144. x1=(8+12)/2=10. x2=(8-12)/2=-2
2. x+3=+6. x1=3
x+3=-6. x2=-9
3. 11-x=5. x=6
11-x=-5. x=16
1) x² - 8x - 20 = 0
D = 144, √144 = 12,
x1 = -2, x2 = 10 - ОТВЕТ
2) (x+3)² = 36
x + 3 = +/- 6
x1 = 6-3 = 3
x2 = - 6 - 3 = - 9
ОТВЕТ -9, 3
3) (11 - x)² = 25
11 - x = +/- 5
x1 = 11-5 = 6, x2 = 11+5 = 16
ОТВЕТ: 6, 16