Ответ:
1)x^2=3x+4
x^2-3x-4=0
x^2+x-4x=0
x(x+1)-4(x+1)=0
(x+1)*(x-4)=0
x+1=0 x-4=0
x=-1. x=4
2)2x^2+20=14x
X^2+10=7x
X^2+10-7x=0
X^2-7x+10=0
X^2-2x-5x+10=0
X(x-2)-5(x-2)=0
(X-2)*(x-5)=0
X=2. X=5
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Answers & Comments
Ответ:
1)x^2=3x+4
x^2-3x-4=0
x^2+x-4x=0
x(x+1)-4(x+1)=0
(x+1)*(x-4)=0
x+1=0 x-4=0
x=-1. x=4
2)2x^2+20=14x
X^2+10=7x
X^2+10-7x=0
X^2-7x+10=0
X^2-2x-5x+10=0
X(x-2)-5(x-2)=0
(X-2)*(x-5)=0
X=2. X=5
X^2+10=7x
X^2+10-7x=0
X^2-7x+10=0
X^2-2x-5x+10=0
X(x-2)-5(x-2)=0
(X-2)*(x-5)=0
X=2. X=5