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anastasiyakult
@anastasiyakult
October 2021
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Помогите пожалуйста ..номер 6
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nafanya2014
Verified answer
1) x²+x=0
x(x+1)=0
x=0 или х+1=0
х=0 или х =-1
2) х²-4x +3=0
D=(-4)²-4·3=16-12=4
x=(4-2)/2=1 или x=(4+2)/2=3
3) 5x²+14x-3=0
D=14²-4·5·(-3)=196+60=256=16²
x=(-14-16)/10=-3 или x=(-14+16)/10=2/10=0,2
4) x² - 2x - 2 = 0
D=(-2)²-4·(-2)=4+8=12=(2√3)²
x=(2-2√3)/2=1-√3 или x=(2+2√3)/2=1+√3
5) 5x=3x²
5x-3x²=0
x (5-3x)=0
x=0 или 5-3х=0 ⇒х=5/3
6) х² -5х+4=0
D=(-5)²-4·4=25-16=9=3²
x=(5-3)/2=1 или x=(5+3)/2=4
7)=8) 7x²-4=0
(√7·x-2)(√7·x+2)=0
√7·x-2=0 или √7·x+2=0
x=2/(√7) или x = -2/(√7)
9) x² - x - 6 = 0
D= (-1)²-4·(-6)=1+24=25=5²
x=(1-5)/2=-2 или x=(1+5)/2=3
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Answers & Comments
Verified answer
1) x²+x=0x(x+1)=0
x=0 или х+1=0
х=0 или х =-1
2) х²-4x +3=0
D=(-4)²-4·3=16-12=4
x=(4-2)/2=1 или x=(4+2)/2=3
3) 5x²+14x-3=0
D=14²-4·5·(-3)=196+60=256=16²
x=(-14-16)/10=-3 или x=(-14+16)/10=2/10=0,2
4) x² - 2x - 2 = 0
D=(-2)²-4·(-2)=4+8=12=(2√3)²
x=(2-2√3)/2=1-√3 или x=(2+2√3)/2=1+√3
5) 5x=3x²
5x-3x²=0
x (5-3x)=0
x=0 или 5-3х=0 ⇒х=5/3
6) х² -5х+4=0
D=(-5)²-4·4=25-16=9=3²
x=(5-3)/2=1 или x=(5+3)/2=4
7)=8) 7x²-4=0
(√7·x-2)(√7·x+2)=0
√7·x-2=0 или √7·x+2=0
x=2/(√7) или x = -2/(√7)
9) x² - x - 6 = 0
D= (-1)²-4·(-6)=1+24=25=5²
x=(1-5)/2=-2 или x=(1+5)/2=3