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Шарарашка090
@Шарарашка090
July 2022
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[tex]- x^{2} -20x-91=0[/tex]
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ShirokovP
Verified answer
- X^2 - 20X - 91 = 0 /:(-1)
X^2 + 20X + 91 = 0
D = 400 - 364 = 36
X1 = ( - 20 + 6)/2 = - 14/2 = - 7
X2 = ( - 20 - 6)/2 = - 26/2 = - 13
3 votes
Thanks 1
Шарарашка090
А разве обязательно на -1 делить?
Gang478
-х²-20х-91=0
х²+20х+91=0
D=400-4*1*91=√36
x1=-20+6/2=-14/2=-7
x2=-20-6/2=-26/2=-13
1 votes
Thanks 1
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Answers & Comments
Verified answer
- X^2 - 20X - 91 = 0 /:(-1)X^2 + 20X + 91 = 0
D = 400 - 364 = 36
X1 = ( - 20 + 6)/2 = - 14/2 = - 7
X2 = ( - 20 - 6)/2 = - 26/2 = - 13
х²+20х+91=0
D=400-4*1*91=√36
x1=-20+6/2=-14/2=-7
x2=-20-6/2=-26/2=-13