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alinamatveeva2000
@alinamatveeva2000
October 2021
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разложить на множители
1)x^2+3x-4
2)x^2-49
3)x^2+2x-8
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Answers & Comments
anastasya5397
X^2+3x-4
D=3*3-4*(1*(-4))=9+16=25
х1=(-3+5)/2=1
х2=(-3-5)/2=-4
x^2+3x-4=(х-1)(х+4)
х^2-49=(x-7)(x+7)
X^2+2x-8
D=2*2-4(1*(-8))=36
x1=(-2+6)/2=2
x2=(-2-6)/2=-4
X^2+2x-8=(x-2)(x+4)
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Answers & Comments
D=3*3-4*(1*(-4))=9+16=25
х1=(-3+5)/2=1
х2=(-3-5)/2=-4
x^2+3x-4=(х-1)(х+4)
х^2-49=(x-7)(x+7)
X^2+2x-8
D=2*2-4(1*(-8))=36
x1=(-2+6)/2=2
x2=(-2-6)/2=-4
X^2+2x-8=(x-2)(x+4)