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Сгоовлвльоыолв
@Сгоовлвльоыолв
July 2022
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Решите 2 уравнение:
8) (x-2)²-25=0
10) (3x+4)²-50=0; Тэарэму Виета не изучали
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Djasurxon
8)
(x-2)^2-25=0
(x-2)^2-5^2=0
(x-2-5)(x-2+5)=0
(x-7)(x+3)=0
x-7=0. x+3=0
x=7. x=-3
10)
(3x+4)^2-50=0
9x^2+24x+16-50=0
9x^2+24x-36=0 |:3
3x^2+8x-12=0
D=b^2-4ac=64+144=208
x1=(-8+√208)/6=(-8+4√13)/6=(-4+2√12)/6
x2=(-8-√208)/6=(-4-2√13)/6
1 votes
Thanks 0
NonameBOYkz
X^2-4x+4-25=0
x^2-4x-21=0
d=16+84=100
x1/2=4+/-10/2=7/-3
9x^2+24x+16-50=0
3x^2+8x-17=0
d=16+4×3×17=220
x1/2=-8+/-2sqrt55
всё
1 votes
Thanks 0
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Answers & Comments
(x-2)^2-25=0
(x-2)^2-5^2=0
(x-2-5)(x-2+5)=0
(x-7)(x+3)=0
x-7=0. x+3=0
x=7. x=-3
10)
(3x+4)^2-50=0
9x^2+24x+16-50=0
9x^2+24x-36=0 |:3
3x^2+8x-12=0
D=b^2-4ac=64+144=208
x1=(-8+√208)/6=(-8+4√13)/6=(-4+2√12)/6
x2=(-8-√208)/6=(-4-2√13)/6
x^2-4x-21=0
d=16+84=100
x1/2=4+/-10/2=7/-3
9x^2+24x+16-50=0
3x^2+8x-17=0
d=16+4×3×17=220
x1/2=-8+/-2sqrt55
всё