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FoxikYT
@FoxikYT
July 2022
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Решите номер 545 а.в и 546 а,в
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MrCalling
X²(x-5)-x(x-5)-42(x-5)=(x-5)(x²-x-42)=(x-5)(x+6)(x-7)
x²-x-42=0
D=1²-4*1*(-42)=1+168=169
x1
x2=
=7
2v²(1-v²)-5v(1-v²)-3(1-v²)=(1-v²)(2v²-5v-3)=(1-v)(1+v)(v+0,5)(v-3)
2v²-5v-3=0
D=(-5)²-4*2*(-3)=49
x1=
x2=
=(x-1)(x+1)(x-2)(x+2)
это би квадратное урвнение
x²=a
a²-5a+4=0
D=(-5)²-4*1*4=9
x1=
x2=
x²=1⇒x=+-1
x²=4⇒x=+-2
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FoxikYT
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MrCalling
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Answers & Comments
x²-x-42=0
D=1²-4*1*(-42)=1+168=169
x1
x2==7
2v²(1-v²)-5v(1-v²)-3(1-v²)=(1-v²)(2v²-5v-3)=(1-v)(1+v)(v+0,5)(v-3)
2v²-5v-3=0
D=(-5)²-4*2*(-3)=49
x1=
x2=
=(x-1)(x+1)(x-2)(x+2)
это би квадратное урвнение
x²=a
a²-5a+4=0
D=(-5)²-4*1*4=9
x1=
x2=
x²=1⇒x=+-1
x²=4⇒x=+-2